The Vape Debate: This New Trend May Be Riskier Than You Think MedStar Health Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Another Gross Reason to Put Down the E Cigarettes American Lung Association E cigarette flavors are toxic to white blood cells, warn scientists Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Mayo Clinic Minute: Are e cigarettes safe? YouTube