Secondhand Electronic Cigarette Aerosol and Indoor Air Quality US EPA Tobacco Smoke, Vaping, and Asthma AAFA.org How Vape Pens Could Threaten the Pot Legalization Movement Mother Jones Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Here's how your dab pen and vape could affect your mental health National Geographic Secondhand smoke and secondhand aerosol