Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Secondhand Smoke and Electronic Cigarette Aerosols US EPA Vaping vs Smoking: Effects and Tips for Protecting Your Lungs Max Hospital Does Vaping Cause Secondhand Smoke? Tobacco Smoke, Vaping, and Asthma AAFA.org Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN