Breastfeeding MedicineAhead of Print EditorialFree AccessSmoking, Vaping, While Breastfeeding in the Era of COVID-19Arthur I. EidelmanArthur I. Eidelman—Arthur I. Eidelman, MD, FABM, Editor in Chief, Breastfeeding Medicine Search for more papers by this authorPublished Online:28 Sep 2021https://doi.org/10.1089/bfm.2021.29192.aieAboutSectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack Citations Back To Publication ShareShare onFacebookTwitterLinked InRedditEmail This month's issue of Breastfeeding Medicine includes a most balanced summary by our regular esteemed contributor Phil Anderson regarding the dilemma of proscribing smoking cessation/reduction products to breastfeeding mothers. Estimates as to maternal postpartum smoking prevalence vary, but surveys of high-income countries report a rate of ∼10%.1 These levels do not include data from recent reports regarding the additional exposure to nicotine that results from the increased prevalence of >7% of e-cigarette use (vaping), particularly by teenagers and young adults.2 Unfortunately, specific data as to prevalence in nursing mothers are, to date, lacking.Smoking by breastfeeding mothers has been associated with reduced volume of breast milk, earlier weaning, and an increased risk for sudden infant death syndrome.3 Tobacco smoking itself has a negative effect on the macrocomposition of the milk as it decreases lipids, protein, and caloric content. In addition, smoking results in decreased antioxidant property of human milk. These negative effects have been attributed primarily to the pharmacologic effect of nicotine, but also to the effect of other toxic substances such as tar, lead, and cadmium. As such, use of e-cigarettes that results in less exposure of the mother to these toxic substances might well be preferable. Unfortunately data as to such a therapeutic trial are unavailable. However, one should note the recent disturbing report from McBride4 that noted an association of e-cigarette use during pregnancy and a decreased frequency of breastfeeding postpartum.In these days of the COVID-19 pandemic, the inevitable question is does smoking increase the risk of severe disease in those infected with the virus. Given the fact that smoking is an established risk factor for a myriad of pulmonary diseases, one would expect a clear-cut association with COVID-19 severity. Surprisingly, to date the population epidemiological surveys are inconclusive, with reports such as that of Karanasos5 who reported that smoking was associated with higher odds of severe disease, whereas another meta-analysis by Farsalinos,6 using a different methodology reported that in patients who were smokers, there was no increased risk for COVID-19 severe disease and or mortality.This seeming counter-intuitive finding may be supported by our understanding more fully the function of the nicotinic acetyl choline receptors who when stimulated (by nicotine) facilitate a pathway that modulates the activity of the immune system. Thus, it is postulated that exposure to nicotine (paradoxically) minimizes an uncontrolled immune response that is triggered by the COVID-19 virus, a response that may well be a major factor (mechanism) in inducing a severe morbidity/mortality outcome.These preliminary data surely do not legitimate the use of nicotine as a therapeutic modality in the treatment of COVID-19. In fact as Anderson details, the primary goal in the situation where a breastfeeding mother is also a smoker should be to maximize the continued and well-documented benefits of exclusive breastfeeding while minimizing the infant's exposure to the combined toxicity of smoking as much as possible. Thus, as he recommends the absolute goal should be to have the mother stop smoking and provide cautiously and judiciously an alternative less toxic source of nicotine such as patches and e-cigarettes for the mother to proceed with a weaning process. It is clear that no smoking cessation therapy appears to be ideal for nursing mothers as the various drugs have a theoretical potential toxicity for the breastfed infant or they have not been adequately studied for efficacy. But as Anderson so simply puts it, smoking cessation products are preferable to continued smoking during breastfeeding. Surely in these days of COVID-19.