Vaping Produces Far Less Second Hand Nicotine Than Smoking Respiratory Therapy Protecting Youth From the Harms of Vaping Smoking and Tobacco Use CDC E Cig Vapor Or Secondhand Smoke: Which Is Worse For You? Parents using e cigs expose kids to dangerous secondhand vapor Futurity Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London