Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Vaping Produces Far Less Second Hand Nicotine Than Smoking Respiratory Therapy E Cig Vapor Or Secondhand Smoke: Which Is Worse For You? Scientists Warn Against Breathing in Secondhand Vape 'Smoke' Newsweek Is it safe to vape around babies & children? How it affects them Allen Carr's Easyway Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN