Scientists Warn Against Breathing in Secondhand Vape 'Smoke' Newsweek Juul study shows secondhand vaping emissions are less toxic than cigarette smoke Tobacco Smoke, Vaping, and Asthma AAFA.org Second hand e cigarette vapour increases risk of poor respiratory health, study finds Nursing in Practice Researchers Warn of Potential Harm From E Cigarette Secondhand Vapor AZPM About E Cigarettes (Vapes) Smoking and Tobacco Use CDC