30-day Marijuana Use Research Articles

Abstract 11890: Association Between State Marijuana Legalization Policies and Marijuana Use Reasoning Among Adults With Cardiovascular Disease, 2017-2020

Introduction: The rapid adoption of marijuana legalization policies in states has forced clinicians to evaluate the health effects of marijuana due to increased availability; however, little is known about changes in marijuana use among adults with CVD after legalization (medical, recreational, dual) in the US. Methods: Using a sample of 298,651 adults from 2017-2020 survey data from the Behavioral Risk Factor and Surveillance System (BRFSS), we estimated the prevalence of recent (past-month) marijuana use in eleven states among adults with and without CVD by marijuana legalization (ML) status of a state. Multivariate logistic regression models were conducted to examine factors associated with marijuana use by self-reported CVD status. Results: Recent marijuana use was higher among adults with CVD in ML states compared to non-ML states (10.7% vs. 6.4%). The mean days of marijuana use in the CVD cohort in ML-states were 17.2±15.5, and 16.1±13.7 days in non-ML-states. Medical use among CVD adults decreased from 57.4% in 2017 to 47% in 2020. In contrast, dual-use increased from 14.4% in 2017 to 30.9% in 2020. However, trends were different in ML vs non-ML states(Figure). Adults with CVD in ML-states had higher (OR=1.75, p<.001), while in non-ML states had lower (OR=0.81, p<0.05), odds of marijuana use compared to those without CVD in non-ML states (reference group). Among CVD adults who used marijuana, odds of medical use were 85% higher in ML-states (OR=1.85, p<0.05), while more than two-fold for recreational (OR=2.10, p<0.05) and 2.5-fold for dual-use (OR=2.53, p<0.05), than non-ML states. Conclusions: We found a higher prevalence and likelihood of marijuana use in adults with CVD living in legalized vs. non-legalized states, which was not unexpected. However, marginal decline in use for medical reasons in ML states with the increasing prevalence of recreational and dual-use in the CVD population requires greater attention to the risk/benefits of individual preferences.

Comparing Substance Use and School-Based Stressors Among Black and Latinx Transgender Youth and Peers With Shared Minoritized Identities

PurposeThe aim of this study is to compare substance use and school-based stressors among Black and Latinx transgender youth (trans BLY), White transgender youth (trans WY), and Black and Latinx cisgender youth (cis BLY) and identify associations between substance use and stressors among trans BLY. MethodsWe analyzed 2015–2017 Biennial California Healthy Kids Survey data with a weighted sample of the state’s secondary school population. The analytic sample included 9th and 11th grade trans BLY, trans WY, and cis BLY. Past 30-day and lifetime substance use (cigarettes, e-cigarettes/vaping, marijuana, and alcohol) and school-based stressors (victimization, race-, gender-, and sexuality-based harassment) were compared between cohorts via logistic regression. For trans BLY, associations between substance use and stressors were assessed via logistic regression. ResultsThe analytic sample (n = 19,780) included 252 trans BLY, 104 trans WY, and 19,424 cis BLY. Among trans BLY, estimated prevalence of 30-day (and lifetime) use of cigarettes, e-cigarette/vaping, marijuana, and alcohol were 13% (23%), 19% (39%), 27% (42%), and 29% (48%), respectively. Trans BLY had similar odds of 30-day and lifetime use of all substances compared to trans WY but higher odds of use compared to cis BLY. For trans BLY, race- and gender-based harassment and higher victimization levels were associated with higher odds of 30-day and lifetime use of all substances. Sexuality-based harassment was associated with higher odds of 30-day and lifetime marijuana and alcohol use. DiscussionTrans BLY have high prevalence of substance use, comparable with trans WY but higher than cis BLY. Substance use among trans BLY is associated with school-based stressors.

Patterns in Mental Health Symptomatology and Cigarette, E-cigarette, and Marijuana Use Among Texas Youth and Young Adults Amid the Coronavirus Disease 2019 Pandemic.

This study examined patterns in mental health symptomatology and smoking and vaping behaviors among youth and young adults over a 1-year period from before to during the first year of the Coronavirus Disease 2019 (COVID-19) pandemic. Participants (n = 2148) were 16-24-year-olds who completed three waves of the Texas Adolescent Tobacco and Marketing Surveillance Study (TATAMS). Descriptive statistics and mixed effects logistic regression models were used to examine changes in anxiety symptoms, depressive symptoms, perceived stress, and cigarette, e-cigarette, and marijuana use from before COVID-19 (fall 2019) to 6-month follow-up (spring 2020) and 12-month follow-up (fall 2020) periods during COVID-19. Longitudinal associations between mental health symptomatology and smoking and vaping were examined. Modest increases in symptoms of anxiety and depression were observed from before to during COVID-19. Perceived stress remained high and unchanged. Ever marijuana use increased at 6- and 12-month follow-up, while ever cigarette and e-cigarette use increased significantly only at 12-month follow-up. Marijuana use frequency increased significantly at 6- and 12-month follow-ups. Adjusting for sociodemographic factors, increased symptoms of anxiety and depression predicted increases in ever cigarette, e-cigarette, and marijuana use, and past 30-day cigarette and e-cigarette use, but not past 30-day marijuana use. Higher perceived stress predicted increases in ever use of cigarettes and e-cigarettes and past 30-day cigarette use. Changes in mental health symptomatology and smoking and vaping behaviors among young people in Texas varied during this period of the COVID era. Increases in mental health symptomatology predicted increases in cigarette, e-cigarette, and marijuana use behaviors. This study adds to the limited research on the longitudinal impact of anxiety symptoms, depressive symptoms, and perceived stress on cigarette, e-cigarette, and marijuana use from before to during the first year of the COVID-19 pandemic. Findings warrant health messaging and interventions that address the significant impact of worse mental health on increased smoking and vaping behavior, especially during crises like COVID-19 that may exacerbate mental health and substance use behaviors.

Substance Use Behaviors Among LGBTQ+ Youth of Color: Identification of the Populations Bearing the Greatest Burden in Three Large Samples

PurposeResearch has identified persistent disparities in alcohol, e-cigarette, and marijuana use, by sexual orientation, gender identity, and race/ethnicity. Using an intersectionality framework, the present study analyzes three large datasets to identify intersecting social positions bearing the highest burden of substance use. MethodsData from adolescents in grades 9–12 in three samples (2019 Minnesota Student Survey, 2017–2019 California Healthy Kids Survey, and 2017 National Teen Survey) were harmonized for an analysis (N = 602,470). A Chi-squared Automatic Interaction Detection analysis compared the prevalence of four types of substance use across all combinations of four social positions (six racial/ethnic identities, five sexual orientations, three gender identities, and two sexes assigned at birth). For each substance, 10 intersectional groups with the highest prevalence of use were examined. ResultsIn the full sample, 12%–14% of participants reported past 30-day alcohol, e-cigarette, or marijuana use and 7% reported past 30-day binge drinking. Several intersecting marginalized social positions were consistently found to bear a high burden of substance use. For example, transgender and gender diverse (TGD) Latina/x/o young people, particularly those assigned male at birth, were in the high prevalence groups for alcohol use, binge drinking, and marijuana use. Black TGD or gender-questioning youth were commonly in the high prevalence groups. DiscussionFindings suggest that support, resources, and structural changes specifically tailored to youth with multiple marginalized identities (especially TGD) may be needed. The results argue for intersectional efforts that explicitly address racial/ethnic and cultural differences, while also integrating awareness and understanding of sexual and gender diversity.

Structural vulnerability as a conceptual framework for transgender health research: findings from a community needs assessment of transgender women of colour in Detroit

The concept of structural vulnerability explains how systems of oppression drive health inequities by reducing access to survival resources (e.g. food, housing) for marginalised populations. Indicators of structural vulnerability such as housing instability, violent victimisation and poverty are often interconnected and result from intersectional oppression. We sought to demonstrate the utility of the structural vulnerability framework for transgender health research by examining patterns of structural vulnerability indicators among transgender women of colour in Detroit. We conducted latent class analysis and tested associations between classes and mental health and substance use outcomes. Membership to the Lowest Vulnerability class was negatively associated with post-traumatic stress disorder (PTSD) (aOR = 0.10, 95% CI: 0.02-0.59). High Economic Vulnerability membership was associated with daily marijuana use (aOR = 4.61, 95% CI: 1.31-16.16). Complex Multi-Vulnerability membership was associated with PTSD (aOR = 9.75, 95% CI: 2.55-37.29), anxiety (aOR = 4.12, 95% CI: 1.22-13.97), suicidality (aOR = 6.20, 95% CI: 1.39-27.70), and club drug use (aOR = 4.75, 95% CI: 1.31-17.29). Substantively different findings emerged when testing relationships between each indicator and each outcome, highlighting the value of theoretically grounded quantitative approaches to understanding health inequities. Community-driven interventions and policy changes that reduce structural vulnerability may improve mental health and substance use outcomes among structurally vulnerable trans women of colour.

Discrimination, Substance Use, and Mental Health among Sexual and Gender Minority Adults Accessing Day Shelter Services

Background Sexual and gender minority (SGM) adults are overrepresented in the population of individuals experiencing homelessness, and high rates of substance use are common in this group. Plausibly, poor mental health and discrimination may contribute to substance use among SGM adults experiencing homelessness. This study described participant characteristics, and the interrelations among sociodemographic variables, substance use, mental health, and discrimination experiences among 87 SGM adults seeking services at a day shelter in Oklahoma City, OK. Discrimination experiences were characterized by race (White vs. non-White), sex (female vs. male), sexual identity (heterosexual vs. sexual minority), and gender identity (gender conforming vs. gender minority). Methods Participants reported their past 30-day tobacco (cigarette/cigarillos, alternative tobacco products [ATP]), alcohol, and marijuana use, as well as everyday and lifetime major discrimination experiences, substance use problems, depression, anxiety, and post-traumatic stress disorder (PTSD). Independent samples t-tests examined differences in discrimination based on substance use and mental health. Results Participants had high rates of tobacco and marijuana use, substance use problems, depression, anxiety, and PTSD. Over 80% reported experiencing everyday or lifetime major discrimination. Depression and PTSD were associated with ATP use, and anxiety was associated with alcohol use. All mental health variables were associated with substance use problems and everyday discrimination. Depression was associated with lifetime major discrimination. Conclusions SGM adults accessing shelter services frequently experienced discrimination and poor mental health, and substance use was common. Future research should examine the causal impact of discrimination on mental health and substance use among SGM adults experiencing homelessness.

Characterizing tobacco and marijuana use among youth combustible tobacco users experiencing homelessness \u2013 considering product type, brand, flavor, frequency, and higher-risk use patterns and predictors

BackgroundCigarette smoking is three times more prevalent among youth experiencing homelessness compared with the general population. Co-use of tobacco and marijuana is also common. The aim of this study is to characterize tobacco and marijuana use among youth experiencing homelessness who use combustible tobacco in a Midwestern city to inform smoking cessation intervention.MethodsThis study included 96 youth (ages 14–24 years; 52% male, 39% female, 5% transgender/non-binary) attending a homeless drop-in center who had used at least one combustible tobacco product in the past week. We assessed past-month use of tobacco products and marijuana, other product use characteristics (e.g., frequency, brand and flavor), and psychosocial predictors of more frequent (i.e., daily) use of combustible tobacco and marijuana.ResultsMost youth experiencing homelessness with past-week combustible tobacco use had used cigarettes (n = 85, 88.5%), cigars (n = 89, 92.7%), and marijuana (n = 82, 85.4%) in the past month. One-third (n = 34) used electronic vapor products (EVPs), 19.8% (n = 19) smoked hookah, and 11.5% (n = 11) used smokeless tobacco (ST). Most marijuana users co-administered with tobacco (n = 67, 69.8%). Daily combustible tobacco smoking was associated with having a child and smoking out of boredom/habit. Daily marijuana use was associated with using substances to cope with one’s housing situation. Newport (n = 66, 72.5%) and Black & Mild (n = 48, 51.1%) were the most popular brands of cigarettes and cigars among ever users. Most non-combustible tobacco ever users reported not having a usual brand (EVPs: n = 51, 73.9%; ST: n = 16, 57.1%). Cigar smokers reported the most varied selection of flavors.ConclusionsYoung combustible tobacco users experiencing homelessness engage in high-risk use patterns, including poly-tobacco use, co-use of tobacco with marijuana, and frequent combustible product use. Interventions that consider the full context of tobacco and marijuana use are needed to support smoking cessation in this population.

Testing Narrative Persuasion of a Culturally Grounded, School-Based “Dale Se REAL” Entertainment-Education Intervention and Peer Communication on Nicaraguan Adolescent Substance Use

Guided by narrative engagement theory and social cognitive theory, the present study investigates effects of narrative persuasion and peer communication on Nicaraguan adolescent substance use. Eighth-grade students in Nicaragua were recruited to participate in the culturally grounded, school-based prevention intervention Dale se REAL and to watch five entertainment-education intervention videos that teach drug refusal communication strategies. Using the cross-sectional survey (N = 224), a path analysis was run to examine the mediated moderation effects of narrative engagement (e.g., interest, realism, and identification with main characters) and peer communication about the intervention videos (e.g., frequency and valence of communication) on adolescent refusal self-efficacy and substance use behaviors. Results revealed that realism was significantly related to adolescent refusal self-efficacy and frequent peer communication moderated the association between refusal self-efficacy and the past 30-day marijuana use. Findings suggest that health communication scholars should take into consideration social factors and cultural contexts for adolescent substance use prevention research.

Smoke-free Ordinances and Youth Tobacco Use in Kentucky.

Determine associations of strength of local smoke-free laws and urban/rural location with cigarette and smokeless tobacco use among high school students in grades 10 and 12. Secondary data analysis from the 2004-2018 biennial Kentucky Incentives for Prevention Survey. Public high schools in Kentucky. N = 353502 10th/12th graders. County-level smoke-free law status from the Kentucky Center for Smoke-free Policy; Rural Urban Continuum Codes; self-reported last 30-day alcohol, marijuana, cigarette, and smokeless tobacco use. Generalized estimating equations modeling assessed the association of law status and urban/rural location with tobacco use across cohorts, controlling for demographics and other substance use. Students in counties with a comprehensive smoke-free law were 23% less likely to smoke cigarettes and 16% less likely to use smokeless, compared to those in counties without a law. Students in counties with moderate/weak laws did not differ in likelihood of use for either product, compared to those in counties without a law. Students in urban counties were 14% less likely to smoke, but there was no difference in likelihood of smokeless use by urban/rural location. Comprehensive smoke-free laws are associated with a lower likelihood of youth cigarette and smokeless use. Rural youth may be at increased risk of cigarette smoking relative to youth in urban areas.

Daily Marijuana Use Predicts HIV Seroconversion Among Black Men Who Have Sex with Men and Transgender Women in Atlanta, GA.

We evaluated whether different types of substance use predicted HIV seroconversion among a cohort of 449 Black men who have sex with men (MSM) and transgender women (TGW). A community-based sample was recruited in Atlanta, GA between December 2012 and November 2014. Participants completed a survey and were tested for STIs (Chlamydia and gonorrhoeae using urine samples and rectal swabs) at baseline. HIV testing was conducted at 12-months post enrollment. Multivariable binary logistic regression was used to estimate adjusted odds ratios (aORs) and 95% confidence intervals (CI) for associations between substance use and HIV seroconversion. By 12-month follow-up, 5.3% (n = 24) of participants seroconverted. In multivariable analyses, daily marijuana use was positively associated with HIV seroconversion (aOR 3.07, 95% CI 1.11-8.48, P = 0.030). HIV incidence was high and daily marijuana use was associated with a more than threefold increased odds of HIV seroconversion among a community-based cohort of Black MSM and TGW.

Marijuana Use is Not a Contraindication for Tranexamic Acid Utilization in Lumbar Spine Surgery.

Retrospective cohort study. The purpose of this study was to evaluate safety in lumbar spinal fusion with tranexamic acid (TXA) utilization in patients using marijuana. This was a retrospective cohort study involving a single surgeon's cases of 1 to 4 level lumbar fusion procedures. Two hundred and ninety-four patients were followed for ninety days post-operatively. Consecutive patients were self-reported for daily marijuana use (n = 146) and compared to a similar cohort of patients who denied usage of marijuana (n = 146). Outcomes were collected, which included length of stay (LOS), estimated blood loss (EBL), post-operative myocardial infarction, seizures, deep venous thrombosis, pulmonary embolus, death, readmission, need for further surgery, infection, anaphylaxis, acute renal injury, and need for blood product transfusion. Patients in the marijuana usage cohort had similar age (58.9years ±12.9 vs 58.7years ±14.8, P = .903) and distribution of levels fused (P = .431) compared to the non-usage cohort. Thromboembolic events were rare in both groups (marijuana usage: 1 vs non-usage: 2). Compared to the non-usage cohort, the marijuana usage cohort had a similar average EBL (329.9 ± 298.5mL vs 374.5 ± 363.8mL; P = .254). Multivariate regression modeling demonstrated that neither EBL (OR 1.27, 95% CI 0.64-2.49) nor need for transfusion (OR 1.56, 95% CI 0.43-5.72) varied between cohorts. The non-usage cohort had twice the risk of prolonged LOS compared to the marijuana usage cohort (OR 2.05, 95% CI 1.15-3.63). Marijuana use should not be considered a contraindication for TXA utilization in lumbar spine surgery.

Age groups differences in the prevalence and popularity of individual tobacco product use in young adult and adult marijuana and tobacco co-users and tobacco-only users: Findings from Wave 4 of the population assessment of tobacco and health study

BackgroundTobacco use is high among marijuana and tobacco users, compared to tobacco-only users. This study examined the relative ranking (based on prevalence) of past 30-day tobacco product use separately across young adult and older adult past 30-day marijuana and tobacco co-users and tobacco-only users. MethodPrevalence and relative ranking of past 30-day use of eight different tobacco products and blunts were examined in young adult (ages 18–24) and adults (ages 25 +) tobacco users who did and did not report past 30-day marijuana use (unweighted n = 33,644) from Wave 4 of the Population Assessment of Tobacco and Health study. Multiple logistic regressions examined increased odds of using each product in the past 30-days by marijuana and tobacco co-use. ResultsNearly half (47.9%) of past 30-day young adult tobacco users reported past 30-day marijuana use (e.g., co-use); 27.7% of adult tobacco users reported past 30-day co-use. Cigarettes were the most popular product used in the past 30-days across tobacco-only and co-users of both age groups. Rankings of all other tobacco products differed between the age groups. Among young adult co-users, blunts were ranked the second most popular product used in the past 30-days, followed by e-cigarettes, and then cigarillos/filtered cigars. Among adult co-users, blunts were ranked the fourth most popular product used in the past 30-days. Adult co-users reported significantly higher prevalence of past 30-day use of all combustible products compared to tobacco only users. ConclusionsCo-users may be at increased risk of health consequences given high rates of combustible tobacco use.

Stigma, Social Support, and Substance Use in Diverse Men Who Have Sex With Men and Transgender Women Living with HIV in the US Southeast.

Human immunodeficiency virus (HIV) rates in the southeast United States are high and substance use is common among people living with HIV (PLWH). This study used baseline data from the weCare intervention study to examine factors associated with the use of alcohol, tobacco, and marijuana among racially and ethnically diverse young gay, bisexual, and other men who have sex with men (GBMSM) and transgender women in the southeast who were newly diagnosed as having HIV, not linked to care, out of care, and/or not virally suppressed. Self-reported data were collected from 196 GBMSM and transgender women living with HIV via Audio Computer-Assisted Self-Interview at enrollment. Measures assessed demographics; stigma; social support; basic and clinical service needs; HIV disclosure; social media use; and recent use of alcohol, tobacco, and marijuana. Logistic regression identified correlates of past 30-day substance use. In multivariable analysis, increased age and needing basic support services were associated with past 30-day tobacco, cigarette, electronic cigarette, and/or hookah use. Increased HIV-related stigma and needing basic support services were associated with past 30-day marijuana use. Being White and needing clinical support services were associated with infrequent or no past 30-day marijuana use. HIV-related stigma and needing basic support services were associated with substance use among GBMSM and transgender women living with HIV in the southeastern United States. Routine screening for basic needs could identify GBMSM and transgender women living with HIV at risk for substance use and offer insight into intervention leverage points.

Exploring Differences in Baseline Characteristics among Adults Entering Integrated Residential Treatment for Co-occurring Disorders in 2013 and 2017

ABSTRACT Little is known about patients’ addiction severity, substance use, or mental health symptoms upon entering integrated treatment. This is the first study to compare baseline characteristics among cohorts of patients with co-occurring disorders entering a private integrated residential treatment program in 2013 and 2017; a period when severe and persistent mental illness diagnoses, mental health service use, and overdose deaths increased. Our sample includes 3400 patients entering private, integrated residential treatment during 2013 (n = 1535) and 2017 (n = 1865). Trained staff completed admission interviews of all participants that included the Addiction Severity Index (ASI), a semi-structured interview to evaluate the past 30-day functioning of the following domains: medical, employment, alcohol, drug, legal, family or social support systems, and psychiatric. We used a p-value of 0.05 to assess significance. With the exception of the drug composite score, the 2017 cohort scored higher than the 2013 cohort on all other composite scores. Compared to the 2013 cohort, the 2017 cohort reported more days using alcohol, cocaine, amphetamines, and engaging in polysubstance use. Conversely, the 2017 cohort reported fewer days using other prescription opioids and sedatives than the 2013 cohort. After controlling for age, the 2017 cohort reported more days of marijuana use than the 2013 cohort. The 2017 cohort reported higher rates of the following symptoms: depression, anxiety, hallucinations, and suicidal ideation. Findings underscore differences among integrated treatment patient cohorts for baseline addiction severity, substance use, or mental health symptoms.

Mental health and substance use by sexual minority status in high school students who experienced sexual violence

To examine the association between sexual minority status and the prevalence of emotional distress and substance use among a nationally-representative sample of youth who reported sexual violence victimization. Data were from the 2017 National Youth Risk Behavior Survey, a biennial school-based survey. We restricted the sample to youth who reported any past-year sexual violence victimization. We estimated prevalence ratios using modified Poisson regression with robust error variance to examine associations of sexual minority status with depressive symptomology, suicidality, and substance use. Among the 1364 (9.7%) students who experienced sexual violence, 78% were girls. Relative to heterosexual youth, sexual minority youth had higher prevalence estimates for the emotional distress outcomes and marijuana use. Sexual minority status was associated with depressive symptomology (adjusted prevalence ratio [aPR] 1.33, 95% confidence interval 1.22-1.44), suicidal ideation (aPR: 1.91, 1.66-2.20), medically treated suicide attempt (aPR: 2.74, 1.53-4.93), and past 30-day marijuana use (aPR: 1.29, 1.06-1.57). Among youth who experience sexual violence, sexual minorities may experience more emotional distress and substance use outcomes than heterosexuals. Rape crisis programs and other tertiary interventions should attend to the unique needs of sexual minorities who have been sexually victimized.

Recreational Marijuana Legalization and Co-use With Alcohol Among Adolescents

Little is known about the possible impacts of recreational marijuana legalization on alcohol and marijuana co-use among underage youth. This study examines the association between recreational marijuana legalization in California in 2016 and alcohol and marijuana co-use among adolescents. Additional analyses investigate the associations between recreational marijuana legalization and co-use among past 30-day drinkers and marijuana users and the frequency of alcohol and marijuana use among co-users. This study used annual cross-sectional data from 7th, 9th, and 11th graders (N=3,319,329) who participated in the California Healthy Kids Survey from 2010-2011 to 2018-2019. Measures included past 30-day alcohol and marijuana use and student demographic characteristics, survey year, pre-post recreational marijuana legalization, and urbanicity. Multilevel regression analyses were conducted in 2021. Recreational marijuana legalization was associated with greater odds of past 30-day alcohol and marijuana co-use in the total sample (OR=1.06, 95% CI=1.05, 1.07). Recreational marijuana legalization was more strongly associated with co-use among adolescents who reported past 30-day alcohol use (OR=1.58, 95% CI=1.52, 1.62) and heavy drinking (OR=1.25, 95% CI=1.21, 1.29) but was inversely related to co-use among past 30-day marijuana users (OR=0.76, 95% CI=0.74, 0.78). Among past 30-day co-users, there was a positive association with the frequency of marijuana use (β=0.36, SE=0.07). Recreational marijuana legalization may increase the risk of alcohol and marijuana co-use among adolescents. Greater restrictions on the numbers of alcohol and marijuana retail outlets and hours of operation and advertising and higher taxes on alcohol and marijuana products may help reduce the availability of these substances to adolescents.

Peer selection and influence for marijuana use in a complete network of first-year college students

BackgroundMarijuana is the most frequently used illicit drug among college students, and there is a need to understand the social processes that contribute to young adults’ marijuana use. Substance use behaviors tend to be more similar (homophilous) among individuals with social ties to one another. However, little is known about whether marijuana use homophily within young adult relationships is due to social selection (seeking out ties with similar marijuana use to one’s own) or social influence (adopting similar marijuana use behaviors as one’s ties), or both. Methods: Students (N = 1,489; 54.6% female; Mage = 18.6 years) at one University completed online surveys in their first three semesters of college. Surveys assessed participant characteristics, marijuana use, and ties to up to 10 other students in the whole (sociocentric) network of first-year college students. Stochastic-actor oriented models (SAOMs) were used to analyze the co-evolution of marijuana use and social ties over time. Results: Participants were more likely to select peers with similar past 30-day marijuana use as themselves. Concurrently, students’ past 30-day marijuana use became more similar to their peers’ use over time. Discussion: Evidence for selection and influence effects were highly significant after controlling for network structure and other covariates indicating these processes may work in tandem to increase marijuana use homophily over the first year of college. This highlights the importance of relationships made early in the first-year of college, as these initial peer ties are likely to reinforce marijuana use behaviors that occur within these relationships.

The impact of childhood trauma on substance use trajectories from adolescence to adulthood: Findings from a longitudinal Hispanic cohort study

BackgroundAdverse Childhood Experiences (ACE) are associated with substance use in adolescence and adulthood. However, there is a lack of longitudinal research examining the effect of ACE on substance use trajectories from adolescence through emerging adulthood. ObjectiveThis study examined the role of ACE in substance use trajectories among Hispanic emerging adults. ParticipantsWe surveyed a cohort of Hispanic adolescents (n = 1399) in Southern California across eight survey waves (beginning in 9th grade and continuing through emerging adulthood). MethodsGrowth curve models were used to examine the effect of ACE on past 30-day cigarette, marijuana, and alcohol use over seven time points, and an interaction term of ACE ∗ time was included to investigate the cross-level effect of ACE. ResultsACE was a significant predictor at 9th grade across all substances. Every additional ACE was associated with significantly higher past 30-day cigarette use (β = 0.05, 95%CI = 0.01, 0.10), marijuana use, (β = 0.15, 95%CI = 0.06, 0.25) and alcohol use (β = 0.14, 95%CI = 0.06, 0.21). Across all models, cross level interactions between ACE and time indicated that young adults exposed to more ACE experience significantly steeper inclining trajectories of 30-day cigarette use (β = 0.05, 95%CI = 0.02, 0.68), marijuana use (β = 0.07, 95%CI = 0.03, 0.11), and alcohol use (β = 0.02, 95%CI = 0.02, 0.68) than young adults with fewer ACE. ConclusionACE continue to have an impact on substance use trends through emerging adulthood. Results highlight the graded effect of ACE on substance use during and beyond adolescence and illustrate that ACE exposure is linked to an escalation of substance use frequency.

Proactive and reactive aggression and substance use among detained youth

ABSTRACT Background: Proactive and reactive functions of aggression have been found to be differentially associated with substance use; however, the pattern of associations differs across substance and outcome assessed. Methods: The current study extends extant literature by examining associations between proactive and reactive functions of aggression and frequency of substance use (tobacco, alcohol, marijuana, e-cigarettes, and prescription drugs) 30 days prior to detainment among a sample of justice-involved youth. Further, the moderating effect of behavioral dysregulation on these associations was evaluated. Results: While proactive aggression was positively correlated with past 30-day marijuana and prescription drug use for non-medical purposes, reactive aggression was positively correlated with tobacco, alcohol, marijuana, and prescription drug use. However, only reactive aggression was uniquely associated with past 30-day use, specifically marijuana and prescription drug use. Further behavioral dysregulation moderated associations, such that reactive aggression was positively associated with frequency of tobacco use and marijuana use, but only at low levels of behavioral dysregulation. Conclusions: Reactive aggression appears to be associated with more frequent substance use than proactive aggression during adolescence. Implications for findings are discussed.

E-cigarette and marijuana use and the attainment of obesity prevention guidelines among U.S. adolescents.

The study objectives were to examine the associations of exclusive and dual use of e-cigarettes and marijuana and the attainment of the "Let's Go! 5-2-1-0" obesity prevention guidelines and perceptions of weight status among U.S. adolescents. Data from the 2017 Youth Risk Behavior Survey, a school-based nationally representative cross-sectional study, were analyzed (N=12,578). Participants were categorized based on their past 30-day e-cigarette and marijuana use as: non-users, exclusive e-cigarette users, exclusive marijuana users, and dual users. Adjusted logistic regression models were conducted. Of adolescents, 5.2% were exclusive e-cigarette users, 10.3% were exclusive marijuana users, and 7.4% were dual users. Compared to non-users, exclusive e-cigarette users were more likely (aOR=1.55, 95%CI=1.16-2.07) to meet the physical activity recommendation. Compared to dual-users, exclusive e-cigarette users were more likely (aOR=1.47, 95%CI=1.10-1.97) to meet the screen time recommendation. Compared to non-users, exclusive marijuana users were at increased odds to meet the fruit/vegetable recommendation (aOR=1.33, 95%CI=1.03-1.71), but were at decreased odds to meet the sugar-sweetened beverages recommendation (aOR=0.81, 95%CI=0.65-0.99). Compared to exclusive e-cigarette users, exclusive marijuana users were less likely to meet the screen time (aOR=0.71, 95%CI=0.54-0.93) and physical activity recommendations (aOR=0.60, 95%CI=0.43-0.84). Compared with dual users, exclusive marijuana users were more likely (aOR=1.38, 95%CI=1.01-1.88) to perceive themselves as slightly/very overweight. Compared to non-users, dual users were less likely to meet the sugar-sweetened beverages recommendation (aOR=0.63, 95%CI=0.46-0.87). Adolescent current marijuana users and dual users were less likely to meet obesity prevention guidelines. Prevention efforts are needed to reduce e-cigarette and marijuana use and increase adherence to these guidelines.