In secondhand vape, scientists smell risk American Heart Association Disposable E Cigarette Use among U.S. Youth An Emerging Public Health Challenge New England Journal of Medicine Study shows second hand vaping exposure very low compared to second hand smoking A new study published in Nicotine & Tobacco Research found that those using e cigarettes alone were more than twice as likely to develop COPD than people who didn't use any tobacco products, Juul nicotine hit may be 'worst for kids, best for smokers' WHYY Chemicals