In secondhand vape, scientists smell risk American Heart Association Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN E cigarettes pose threat to users' and bystanders' health Novant Health Healthy Headlines Tobacco Smoke, Vaping, and Asthma AAFA.org Tobacco Smoke, Vaping, and Asthma AAFA.org Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC