Is passive vaping a hidden risk to the public? Here's what the experts know so far ABC News In secondhand vape, scientists smell risk American Heart Association Tobacco Smoke, Vaping, and Asthma AAFA.org Complete Guide to Secondhand Vaping Devices Vape Direct Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Scientists Warn Against Breathing in Secondhand Vape 'Smoke' Newsweek