Parents using e cigs expose kids to dangerous secondhand vapor Futurity What You Should Know about E Cigarettes & Vaping American Lung Association Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Secondhand Smoke and Electronic Cigarette Aerosols US EPA What Does Vaping Do to Your Lungs? Johns Hopkins Medicine E cigarettes and Vaping Commercial Tobacco Use MN Dept. of Health