E-cigarettes Research Articles

Investigation of the in vitro toxic effects induced by real-time aerosol of electronic cigarette solvents using microfluidic chips

The safety of propylene glycol (PG) and vegetable glycerin (VG) as solvents in electronic cigarette liquid has received increasing attention and discussion. However, the conclusions derived from toxicity assessments conducted through animal experiments and traditional in vitro methodologies have consistently been contentious. This study constructed an original real-time aerosol exposure system, centered around a self-designed microfluidic bionic-lung chip, to assess the biological effects following exposure to aerosols from different solvents (PG, PG/VG mixture alone and PG/VG mixture in combination with nicotine) on BEAS-2B cells. The study aimed to investigate the impact of aerosols from different solvents on gene expression profiles, intracellular biomarkers (i.e., reactive oxygen species content, nitric oxide content, and caspase-3/7 activity), and extracellular biomarkers (i.e., IL-6, IL-8, TNF-α, and malondialdehyde) of BEAS-2B cells on-chip. Transcriptome analyses suggest that ribosomal function could serve as a potential target for the impact of aerosols derived from various solvents on the biological responses of BEAS-2B cells on-chip. And the results showed that aerosols of PG/VG mixtures had significantly less effect on intracellular and extracellular biomarkers in BEAS-2B cells than aerosols of PG, whereas increasing nicotine levels might elevate these effects of aerosol from PG/VG mixture.

Puff bars and adolescence: issues and intervention strategies

The popularity of electronic cigarettes among young people in Switzerland has been increasing since the introduction of puffs to the market. According to recent epidemiological data, more than half of 14-25 year olds have tried these devices, potentially exposing themselves to nicotine and substances with little-known long-term effects. This phenomenon raises concerns regarding health risks and the developmental phase during which these consumptions occur. Primary care physicians have a crucial role to play in managing these consumptions through an integrated approach. Involvement of parents is recommended, taking into account confidentiality issues. Strict legislative measures are essential on a public health level to counter this growing trend.

Nicotine or marijuana vaping exposure during pregnancy and altered immune responses in offspring.

Electronic nicotine delivery systems (ENDS) - which include electronic cigarettes or e-cigarettes, or simply e-cigs, and marijuana vaping have become increasingly popular. ENDS devices have been established as one of the tobacco quit methods and promoted to be safer compared to traditional tobacco cigarettes. Emerging evidence demonstrates that e-cigarette and marijuana vape use can be harmful, with potential associations with cancer. Herein, we summarize the level of evidence to date for altered immune response, with a focus on cancer risks in the offspring after maternal use of, or aerosol exposures from, ENDS or marijuana vape during pregnancy. From 27 published articles retrieved from PubMed, we sought to find out identified carcinogens in ENDS aerosols and marijuana vapor, which cross the placental barrier and can increase cancer risk in the offspring. Carcinogens in vaping aerosols include aldehydes, metals, tobacco-specific nitrosamines, tobacco alkaloids, polycyclic aromatic hydrocarbons, and volatile organic compounds. Additionally, there was only one passive vaping exposure case study on a human fetus, which noted that glycerol, aluminum, chromium, nickel, copper, zinc, selenium, and lead crossed from the mother to the offspring's cord blood. The carcinogens (metals) in that study were at lower concentrations compared to the mother's biological matrices. Lastly, we observed that in utero exposures to ENDS-associated chemicals can occur in vital organs such as the lungs, kidneys, brain, bladder, and heart. Any resulting DNA damage increases the risk of tumorigenesis. Future epidemiological studies are needed to examine the effects of passive aerosol exposures from existing and emerging electronic nicotine and marijuana products on developing offspring to cancer.

Implications of Switching from Conventional to Electronic Cigarettes on Quality of Life and Smoking Behaviour: Results from the EQualLife Trial

Introduction: Electronic cigarettes and “vaping” have become popular since their appearance in Europe and the USA in approximately 2006. They are often perceived as having fewer health risks than conventional cigarettes, which makes them of interest as a support tool in smoking cessation. However, its efficacy regarding cessation or reduction of smoking under real-life conditions remains controversial. Our objective was to clarify this question in an observational study of smoking habits after initiating vaping without targeted intervention, as compared to a validated cessation programme. Methods: From October 2015 to April 2018, 80 subjects (60 in the e-cigarette group and 20 in the supervised smoking cessation group) were included in two trial visits, one at the start of the trial and the second after 3 months, plus 4 questionnaire surveys: at the start of the trial and after a 1, 2, and 3 month period. The questionnaire included a nicotine use inventory, a modified Fagerström test for nicotine dependence, and the WHO-QOL-BREF survey. Results: E-cigarettes were effective, leading to a significant (p < 0.03) reduction (p < 0.03) in tobacco consumption and nicotine dependence, with an abstinence rate of 43% after 3 months. Compared to participants in the smoking cessation programme, their use was not associated with an improvement in quality of life during the quitting attempt, and there were no significant differences in clinical symptoms between groups. The reduction in nicotine dependence was more pronounced (p < 0.012) for the smoking cessation programme, with higher abstinence rates (p = 0.011 after 12 weeks) and lower (p < 0.003) remaining tobacco consumption compared to electronic cigarettes. Discussion/Conclusions: The use of electronic cigarettes reduced nicotine dependence and tobacco consumption, but a supervised smoking cessation programme was superior in terms of achieved cessation in both regards. Electronic cigarettes did not improve the quality of life. Since e-cigarettes could be associated with long-term health risks, their usefulness in smoking cessation remains questionable, and a professionally guided and validated smoking cessation programme still appears to be superior and preferable, in terms of achieved cessation. Although this trial is limited regarding the number of participants and follow-up time, it highlights the need for additional, large clinical trials evaluating the efficacy of e-cigarettes for smoking cessation in comparison to a professionally guided smoking cessation programme.

The impact of conventional cigarettes, e-cigarettes, and tobacco heating systems on the oral mucosa

Relevance. Over the past few years, the popularity of nicotine-containing substances and tobacco heating systems has continued to grow, while the demand for conventional tobacco leaf cigarettes has been falling. Electronic cigarettes consist of a heating system and a liquid with various flavorings. During the operation of the heating stick, the liquid is converted into an aerosol, which the user needs to inhale. First of all, the hot steam comes into contact with the oral cavity. The aerosol components settle on the oral mucosa, the approximal surfaces of the teeth, penetrating the body with a saliva current, expose the oral cavity to prolonged exposure, causing various changes in the oral cavity and causing discomfort to the smoker. This problem is urgent and based on the above, it is necessary to study all possible effects of cigarettes and electronic nicotine delivery systems on the human body.Purpose. To assess the impact of nicotine-containing products and smokeless tobacco on the oral mucosa.Materials and methods. A cohort of 98 patients, aged 20 to 60, was recruited for the study. Participants were divided into four groups: Group 1 consisted of conventional cigarette smokers; Group 2, users of vapes; Group 3, users of IQOS; and Group 4 included patients who used all three device types interchangeably.Results. The investigation identified a direct correlation between the participant's age, the device used, and their level of oral hygiene. The poorest oral hygiene was seen in Group 4, where individuals used a combination of conventional cigarettes, vapes, and IQOS. Although a majority acknowledged the harmful effects of tobacco products, only 33 participants were aware of the negative impacts associated with vapes and IQOS.Conclusion. The lack of regulation and awareness of the health risks associated with IQOS and vaping pose substantial challenges for healthcare, indicating a need for more research into these issues.

The Effect of Nicotine-Containing Products on Peri-Implant Tissues: A Systematic Review and Network Meta-Analysis.

Smokers have a higher chance of developing peri-implant diseases and are therefore considered an at-risk population. Our aim was to compare peri-implant characteristics in users of electronic cigarettes (EC), waterpipes (WP), cigarettes (CS), smokeless tobacco (ST), and nonsmokers (nonusers of any nicotine and tobacco product; NS). A systematic search of four electronic databases (PubMed, EMBASE, Web of Science, and CENTRAL) was performed until April 2023, restricted to English language. Thirty-nine observational studies were included in the qualitative synthesis, of which 32 studies were included in a Bayesian network meta-analysis. Using a predesigned form, two researchers independently collected data about marginal bone loss (MBL), probing pocket depth (PPD), plaque index, bleeding on probing, modified plaque index, probing pocket depth > 4 mm (PPD > 4), gingival index, peri-implant sulcular fluid volume, and TNF-α and IL-1β levels. QUIPS and CINeMA were used to evaluate the risk of bias and certainty of evidence. Nonsmokers had the smallest MBL. Most nicotine-containing product users had significantly higher MBL (CS, mean difference [MD]: 1.34 credible interval [CrI]: 0.85, 1.79; WP, MD: 1.58 CrI: 0.84, 2.35; ST, MD: 2.53, CrI: 1.20, 3.87) than NS. Electronic cigarettes did not show significant difference compared to NS (MD: 0.52 CrI: -0.33, 1.36). In secondary outcomes, NS were ranked in first place. Subset analysis based on smoking habit, implant duration, and maintenance control revealed no differences in ranking probability. Most nicotine-containing product users presented worse peri-implant parameters compared to NS, while EC users did not show significant differences to NS in many outcomes. Alternative nicotine-containing products are gaining popularity and are often considered less harmful by the general public compared to traditional cigarettes. This is the first network meta-analysis comparing users of four nicotine-containing products and NS. This study shows that CS, WP, and ST have a detrimental effect on the overall health of peri-implant tissues. EC users also presented inferior parameters compared to NS; however, the difference was not significant in many outcomes. It is essential to educate patients who are using nicotine-containing products, and to provide proper maintenance and appropriate cessation support. Well-designed multiarmed studies are needed for direct comparison of different products, including heated tobacco products. Greater transparency of confounding factors is needed regarding smoking habit and oral hygiene.

The Impact of E-Cigarettes on Oral Injuries and Bone Fractures

Introduction The rising prevalence of electronic cigarette (e-cigarette) use has prompted concerns regarding its potential health implications. While much attention has focused on respiratory and cardiovascular effects, injuries, oral trauma, and bone fractures linked to e-cigarette use have received less scrutiny. This paper aims to comprehensively review the landscape of injuries, oral trauma, and bone fractures induced by e-cigarettes, shedding light on this underexplored facet of e-cigarette-related harm. Material and Methods This literature review has analyzed 16 papers. Inclusion criteria: researches and case reports published after 2015. PubMed and Google Scholar has been searched to identify the papers. Analysis of the Literature Existing literature suggests a growing incidence of injuries, oral trauma, and bone fractures associated with e-cigarette use, albeit with limited systematic investigation. Mechanisms underlying these injuries range from device malfunctions to inadvertent impacts during use. Case reports highlight a spectrum of injuries, including oral burns, dental trauma, and skeletal fractures, often involving the face and mouth regions. Conclusions Despite the lack of comprehensive epidemiological data emerging evidence underscores the need for heightened awareness and preventive measures to mitigate e-cigarette-related injuries. Enhanced education, regulation of e-cigarette devices, and promotion of safer usage practices are crucial steps towards reducing the burden of e-cigarette-related harm on oral and skeletal health.

Exposure to E-Cigarette Marketing and Susceptibility to Future Vaping among Black and Latino Adolescents in the United States.

Evidence suggests an association between exposure to electronic cigarette (e-cigarette) marketing and e-cigarette use (vaping) among adolescents. However, there is limited evidence on exposure to e-cigarette marketing and susceptibility to future vaping, especially among Black and Latino adolescents. This study aimed to examine associations between exposure to e-cigarette marketing and susceptibility to future vaping among Black and Latino adolescents in the United States (US). Participants (N = 362; equal representation between Black and Latino adolescents) completed a baseline assessment (available in English and Spanish) including sociodemographic characteristics (e.g., racial/ethnic group, age, gender, sexual orientation, etc.), exposure to e-cigarette marketing, and susceptibility to future vaping. Exposure to e-cigarette marketing was recoded and organized into two categories (high exposure = 2 to 3; low exposure = 0 to 1). Cochran-Mantel-Haenszel tests were used to evaluate the association between exposure to e-cigarette marketing and susceptibility to future vaping, stratified by racial/ethnic group. Multiple logistic regressions assessed the association between exposure to e-cigarette marketing and susceptibility to future vaping, controlling for gender, sexual orientation, grade, and academic performance within each racial/ethnic group. Black adolescents reported significantly higher frequencies of exposure to e-cigarette marketing (p = 0.005). A significant interaction was found between exposure to e-cigarette marketing and racial/ethnic group (X2 (1) = 6.294, p = 0.012). Among Black adolescents, high exposure to e-cigarette marketing (vs. low exposure) was associated with a higher probability of susceptibility to future vaping (OR: 2.399, 95% CI 1.147-5.021, p = 0.020). For Latino adolescents, exposure to e-cigarette marketing was not associated with susceptibility to future vaping (OR: 0.503, 95% CI 0.245-1.03, p = 0.062). Future studies should evaluate how and where adolescents are exposed to e-cigarette marketing. Prevention efforts must include the implementation of effective counter-marketing campaigns and the reduction of exposure to e-cigarette marketing among Black and Latino adolescents.

Improving Aerosol Characterization Using an Optical Particle Counter Coupled with a Quartz Crystal Microbalance with an Integrated Microheater.

Aerosols, as well as suspended particulate matter, impact atmospheric pollution, the climate, and human health, directly or indirectly. Particle size, chemical composition, and other aerosol characteristics are determinant factors for atmospheric pollution dynamics and more. In the last decade, low-cost devices have been widely used in instrumentation to measure aerosols. However, they present some issues, such as the problem of discriminating whether the aerosol is composed of liquid particles or solid. This issue could lead to errors in the estimation of mass concentration in monitoring environments where there is fog. In this study, we investigate the use of an optical particle counter (OPC) coupled to a quartz crystal microbalance with an integrated microheater (H-QCM) to enhance measurement performances. The H-QCM was used not only to measure the collected mass on its surface but also, by using the integrated microheater, it was able to heat the collected mass by performing heating cycles. In particular, we tested the developed system with aerosolized saline solutions of sodium chloride (NaCl), with three decreasing concentrations of salt and three electronic cigarette solutions (e-liquid), with different concentrations of propylene glycol and glycerin mixtures. The results showed that the OPC coherently counted the salt dilution effects, and the H-QCM output confirmed the presence of liquid and solid particles in the aerosols. In the case of e-liquid aerosols, the OPC counted the particles, and the HQCM output highlighted that in the aerosol, there were no solid particles but a liquid phase only. These findings contribute to the refinement of aerosol measurement methodologies by low-cost sensors, fostering a more comprehensive understanding.

The paradox of the safer cigarette: understanding the pulmonary effects of electronic cigarettes.

Electronic cigarette (e-cigarette) use continues to rise globally. E-cigarettes have been presented as safer alternatives to combustion cigarettes that can mitigate the harm associated with tobacco products; however, the degree to which e-cigarette use itself can lead to morbidity and mortality is not fully defined. Herein we describe how e-cigarettes function; discuss the current knowledge of the effects of e-cigarette aerosol on lung cell cytotoxicity, inflammation, anti-pathogen immune response, mucociliary clearance, oxidative stress, DNA damage, carcinogenesis, matrix remodeling, and airway hyperresponsiveness; and summarize the impact on lung diseases, including COPD, respiratory infection, lung cancer, and asthma. We highlight how the inclusion of nicotine or flavoring compounds in e-liquids can impact lung toxicity. Finally, we consider the paradox of the safer cigarette - the toxicities of e-cigarettes that can mitigate their potential to serve as a harm reduction tool in the fight against traditional cigarettes, and we summarize the research needed in this under-investigated area.

E-cigarette use reasons and associated e-cigarette use dependence among college students: A longitudinal examination

ObjectivePrevious studies have established an understanding of reasons for e-cigarette use and associated e-cigarette use patterns such as use frequency, yet the critical extension to associated e-cigarette dependence outcome remains under-researched. This study used longitudinal data to examine whether the reasons for e-cigarette use predict a higher/lower level of e-cigarette dependence. MethodsThis study recruited college students who were current e-cigarette users from Fall 2019 to Fall 2020 (four semesters) at three public universities in the Midwest and South of the U.S. Those who participated for at least two semesters were included (N = 366). Data were collected using a structured questionnaire. E-cigarette use dependence was assessed using the Penn State Electronic Cigarette Dependence Index. A linear mixed model with a random intercept and a random slope was conducted to examine the longitudinal association between reasons for e-cigarette use and dependence, controlling for demographics and other covariates. ResultsParticipants who used e-cigarettes for relaxation (β = 0.63, p < 0.05) and due to their good taste (β = 0.63, p < 0.05) had a higher level of e-cigarette dependence. Participants using e-cigarettes for experimental purposes had a lower level of e-cigarette dependence (β = -1.21, p < 0.01). ConclusionsThese findings highlight the importance of addressing e-cigarette use reasons and their relationship to e-cigarette dependence. Prevention and intervention efforts aimed at developing more effective strategies should consider the various e-cigarette use reasons associated with dependence risks, such as enhancing awareness of the use dependence risk related to good taste of e-cigarettes and use for relaxation, as well as incorporating early screenings for use.

ТРУДНОСТИ ДИАГНОСТИКИ ПОВРЕЖДЕНИЯ ЛЕГКИХ, АССОЦИИРОВАННОГО С ВЕЙПИНГОМ И ЭЛЕКТРОННЫМИ СИГАРЕТАМИ, У ПОДРОСТКА С МИКОПЛАЗМЕННОЙ ПНЕВМОНИЕЙ

Electronic nicotine delivery systems’ popularity has increased rapidly over the past decade among both adults and children and especially adolescents. With the growing number of consumers, the number of research studies describing the negative effects of e-cigarettes on the respiratory system and the so-called “E-cigarette or Vaping Use-Associated Lung Injury” (EVALI) is growing Worldwide as well. EVALI that occurs simultaneously with a lower respiratory tract infection can be considered as ‘probable EVALI.’ Addition of an infectious agent can be clinically manifested with the development of acute respiratory failure thus complicating the EVALI diagnosis. This Article represents a clinical case observation of an adolescent patient with mycoplasma pneumonia coupled with EVALI.

Reactions to vaping cessation messaging and strategies among US young adults who use e-cigarettes.

Despite high rates of young adult e-cigarette use, research informing cessation interventions for this population, including those unready to quit, is limited. We analyzed 2022 cross-sectional survey data (from a larger longitudinal study) among 172 US young adult, past-month e-cigarette users (mean age=26.95 years; 57.6% female; 73.3% White). We examined: 1) perceived challenges to quitting e-cigarettes; 2) perceived impact of intervention messages targeting motivation and confidence, and their associations with quitting importance and confidence; and 3) poly-use with cigarettes and/or cannabis in relation to poly-product cessation preferences. In all, 43.6% reported past-year e-cigarette quit attempts, and 55.3% reported quit readiness; 30.2% reported past-month poly-use with cigarettes, and 54.1% with cannabis. Frequently endorsed challenges to quitting/cutting down were related to stress/anxiety (41.9%), delaying cessation attempts (35.5%), and boredom (25.6%). Messages targeting motivation perceived as most impactful (scale: 1 = 'no impact at all' to 7 = 'a lot of impact') were related to saving money (mean score=4.78), improving health (mean score=4.15), and avoiding toxic chemicals (mean score=4.04), messages targeting confidence perceived as most impactful were related to patience (mean score=4.47), staying busy (mean score=4.27), and soliciting support (mean score=3.84). Perceiving greater impact of messages targeting motivation was associated with greater quitting importance (B=1.16; 95% CI: 0.71-1.60, p<0.001). Neither perceived impact of messages targeting motivation nor confidence were related to quitting confidence. E-cigarette-cannabis poly-users preferred to quit cigarettes first, e-cigarette-cigarette users preferred to quit cannabis first, and poly-users of all three products preferred to quit e-cigarettes first, followed by cigarettes, then cannabis. E-cigarette cessation interventions must use relevant messages (e.g. target financial and health benefits of quitting) and consider poly-users' preferences for quitting.

The E-liquid flavoring vanillin alters energy and autophagic pathways in human proximal tubule (HK-2) epithelial cells

The use of flavored e-liquids in electronic nicotine delivery systems (ENDS) has become very popular in recent years, but effects of these products have not been well characterized outside the lung. In this study, acute exposure to the popular flavoring vanillin (VAN) was performed on human proximal tubule (HK-2) kidney cells. Cells were exposed to 0–1000 μM VAN for 24 or 48 h and cellular stress responses were determined. Mitochondrial viability using MTT assay showed a significant decrease between the control and 1000 μM group by 48 h. Seahorse XFp analysis showed significantly increased basal respiration, ATP production, and proton leak after 24 h exposure. By 48 h exposure, these parameters remained significantly increased in addition to non-mitochondrial respiration and maximal respiration. Glycolytic activity after 24 h exposure showed significant decreases in glycolysis, glycolytic capacity, glycolytic reserve, and non-glycolytic acidification. The autophagy markers microtubule-associated protein 1A/1B light chain 3 (LC3B–I and LC3B-II) were probed via western blotting. The ratio of LC3B-II/LC3B–I was significantly increased after 24 h exposure to VAN, but by 48 h this ratio significantly decreased. The mitophagy marker PINK1 showed an increasing trend at 24 h, and its downstream target Parkin was significantly increased between the control and 750 μM group only. Finally, the oxidative stress marker 4-HNE was significantly decreased after 48 h exposure to VAN. These results indicate that acute exposure to VAN in the kidney HK-2 model can induce energy and autophagic changes within the cell.

Attitudes, Behaviors, and Perceptions of Students Vaping in Three Mexican Universities.

The increase in the popularity and use of electronic cigarettes (e-cigarettes) has consistently risen worldwide and has become associated with adverse health outcomes. This study has identified the attitudes and perceptions of undergraduate students who vape in three universities in Mexico. A cross-sectional study involving 495 participants was conducted using a survey from October to December 2023. Three universities in different states in Mexico collaborated with colleges in Yucatan, Durango, and Nuevo Leon, Mexico. Descriptive statistics include frequencies and percentages, and four logistic regression models were employed. In the sample, 31% and 17.54% of participants reported smoking and vaping, respectively. Students who reported vaping in the last month reported that their first experience with vaping was at an average of 17.3 years of age, and of those, 71.26% (n = 62) reported having vaped for over 100 days, while the remaining 38% reported vaping for between 2 and 100 days. Students from Veracruz and Yucatan began vaping at a younger age than in the central and northern regions. There is a need to educate students about the dangers of the chemicals in the liquids they use, the secondary exposure vapers, and the health dangers they pose.

Smoking Cessation Tools in the Urological Context: Considering the Genitourinary Impacts of Smoking Cessation Tools

Electronic cigarette use is rising globally. Although it may represent a potential smoking cessation tool, amidst misinformation and social media promotion, there is a growing concern regarding the health risks associated with its usage. These risks include adverse effects on the genitourinary system. This commentary investigates the genitourinary effects of approved smoking cessation tools versus electronic cigarettes, urging urologists to prioritize established methods over electronic cigarettes due to their potential for multisystem toxicity and uncertain long-term health implications. Further research is warranted to evaluate comprehensively the genitourinary effects of these interventions.

Nanocomposite microbeads made of recycled polylactic acid for the magnetic solid phase extraction of xenobiotics from human urine

Nanocomposite microbeads (average diameter = 10–100 µm) were prepared by a microemulsion-solidification method and applied to the magnetic solid-phase extraction (m-SPE) of fourteen analytes, among pesticides, drugs, and hormones, from human urine samples. The microbeads, perfectly spherical in shape to maximize the surface contact with the analytes, were composed of magnetic nanoparticles dispersed in a polylactic acid (PLA) solid bulk, decorated with multi-walled carbon nanotubes (mPLA@MWCNTs). In particular, PLA was recovered from filters of smoked electronic cigarettes after an adequate cleaning protocol. A complete morphological characterization of the microbeads was performed via Fourier-transform infrared (FTIR) spectroscopy, UV–Vis spectroscopy, thermogravimetric and differential scanning calorimetry analysis (TGA and DSC), scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD). The recovery study of the m-SPE procedure showed yields ≥ 64%, with the exception of 4-chloro-2-methylphenol (57%) at the lowest spike level (3 µg L−1). The method was validated according to the main FDA guidelines for the validation of bioanalytical methods. Using liquid chromatography-tandem mass spectrometry, precision and accuracy were below 11% and 15%, respectively, and detection limits of 0.1–1.8 µg L−1. Linearity was studied in the range of interest 1–15 µg L−1 with determination coefficients greater than 0.99. In light of the obtained results, the nanocomposite microbeads have proved to be a valid and sustainable alternative to traditional sorbents, offering good analytical standards and being synthetized from recycled plastic material. One of the main objectives of the current work is to provide an innovative and optimized procedure for the recycling of a plastic waste, to obtain a regular and reliable microstructure, whose application is here presented in the field of analytical chemistry. The simplicity and greenness of the method endows the procedure with a versatile applicability in different research and industrial fields.Graphical

An exploratory, randomised, crossover study to investigate the effect of nicotine on cognitive function in healthy adult smokers who use an electronic cigarette after a period of smoking abstinence

BackgroundAs well as being associated with serious negative health outcomes, smoking has been reported to have an array of physiological and psychological effects, including effects on mood and cognitive function. Post-cessation, loss of such effects (including temporary deficits in cognitive function) have been cited as reasons for resumption of smoking. The effects of e-cigarettes and nicotine delivered by e-cigarettes on these functions have not been widely researched but may play a role in the effectiveness of e-cigarettes as a satisfactory alternative to combustible cigarettes for people who smoke, and in encouraging individuals who would otherwise continue to smoke, to transition to e-cigarettes.MethodsThe study was an exploratory, randomised, partially-blinded, single-centre, five-arm crossover trial that recruited 40 healthy male and female people who smoke. At 5 study sessions, following a 12-h period of nicotine abstinence, participants were randomly assigned to use either a combustible cigarette, an e-cigarette of three varying nicotine strengths (18 mg/mL, 12 mg/mL or 0 mg/mL respectively) or observe a no product usage session. Participants completed pre- and post-product usage assessments to examine the product usage effect on cognitive performance (using the Cambridge Neuropsychological Test Automated Battery (CANTAB)), subjective mood and smoking urges.ResultsA significant improvement in sustained attention task performance was observed following use of both the nicotine containing e-cigarettes and combustible cigarette compared to no product use. Additionally, there were no significant differences between the nicotine containing products, indicating that nicotine use enhanced sustained attention regardless of delivery format. Nicotine containing e-cigarette and combustible cigarette use also significantly improved overall mood of participants compared to no product use, with no significant differences observed between the nicotine containing products. Nicotine containing e-cigarette and combustible cigarette use significantly reduced smoking urges compared to no product use, though combustible cigarette use elicited the greatest reduction in smoking urges.ConclusionsOverall, the nicotine containing products improved sustained attention and mood while reducing smoking urges, with the studied e-cigarettes having comparable effects to combustible cigarettes across the assessed cognitive parameters and mood measures. These results demonstrate the potential role of e-cigarettes to provide an acceptable alternative for combustible cigarettes among people who would otherwise continue to smoke.Trial registration ISRCTN (identifier: ISRCTN35376793).

Abstract LB086: Measuring oral DNA damage to evaluate electronic cigarette use as a tobacco harmreduction strategy

Abstract Background: Smokers increase their risk of numerous types of diseases, including lung and oral cancer. Despite this knowledge, approximately 18.7% of U.S. adults are smokers, and millions of smokers across the U.S. struggle to quit tobacco every day. Although difficult due to nicotine addiction, you can increase your chances of quitting with the tools available, and help is an important part of any quitting plan. The prevalence of electronic cigarette (e-cigarette) use has increased as users perceive them to be safer than traditional tobacco smoke. Studies have shown that e-cigarettes contain fewer chemicals than tobacco smoke. Therefore, addressing the effectiveness of e-cigarette use in reducing tobacco harm is essential and is currently a priority for the FDA. Aim: To determine whether combustible tobacco users who are provided with free e-cigarettes and free e-liquids reduce the levels of DNA damage in their oral epithelial cells. Methods: Adult smokers who smoked at least 5 cigarettes per day over the past year and did not plan to quit smoking in the next 3 months were enrolled in a randomized 3-arm clinical trial (NCT03113136): “Usual Brand Cigarettes” (UBC), Low Wattage e-cigarettes (LWe), and High Wattage e-cigarettes (HWe). Free combustible cigarettes or e-cigarettes plus e-liquid were provided during the first 12 weeks according to assigned group. Tobacco product use details, CO level, and oral mucosa samples were collected at 0, 4, and 12 weeks. DNA was extracted from oral cells and damage was quantified by q-PADDA, at three time points (Week 0, 4, 12). Data analysis was performed using ANOVA model. Results: Participants who provided samples at all time points were included in this DNA damage study. 201 complete data sets (UBC=77, LWe=61 and HWe=66) were available for DNA damage quantification at the time of this report. At enrolment (week 0), there were no significant differences in age, sex or tobacco product use across groups. At 12 weeks, combustible tobacco use was significantly reduced in smokers also using LWe or HWe (dual users). At 4 and 12 weeks, the CO levels were reduced in dual users of combustible tobacco and e-cigarettes (LWe or HWe), compared to exclusive combustible tobacco users. Compared to combustible tobacco users, dual users of combustible tobacco and LWe or HWe showed a significant reduction in the levels of oral mucosa DNA damage at 4 and 12 weeks (3 to 5 fold). Conclusion: Our study shows that when provided with free e-cigarette devices and e-liquids, smokers who were dual users or completely switched to LWe or HWe significantly reduced the levels of DNA damage in their oral mucosa compared with exclusive combustible tobacco users. These data suggest that LW and HW e-cigarette devices are an effective harm reduction tool and might help to reduce tobacco-associated health effects. Funding: NIH/NCI (R01CA204891, Wagener; R01CA242168, Queimado). Citation Format: Vengatesh Ganapathy, Mayilvanan Chinnaiyan, Daniel Brobst, Balaji Sadhasivam, Jean D. Nshimiyimana, Yan Zhao, Theodore Wagener, Lurdes Queimado. Measuring oral DNA damage to evaluate electronic cigarette use as a tobacco harmreduction strategy [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 2 (Late-Breaking, Clinical Trial, and Invited Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(7_Suppl):Abstract nr LB086.

Use of Electronic Cigarette or Vape Associated with Massive Hemoptysis: Case Report

Use of Electronic Cigarette or Vape Associated with Massive Hemoptysis: Case Report