E Cig Vapor Or Secondhand Smoke: Which Is Worse For You? Secondhand Smoke and Electronic Cigarette Aerosol Resources US EPA Vaping Around Babies How Secondhand Vapor Smoke Can Harm Kids Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Is passive vaping a hidden risk to the public? Here's what the experts know so far ABC News