E cigarettes and Vaping Commercial Tobacco Use MN Dept. of Health Secondhand Exposure to E Cigarettes Puts COPD Patients At Risk Respiratory Therapy The risks of vape pens' secondhand aerosols Project Filter Secondhand Vape Informational Poster #1 Idaho Health Tools Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Tobacco Smoke, Vaping, and Asthma AAFA.org