Vaping Safety, Smoking, Dangers, Pros, Cons, Debate, E cigarettes, & Tobacco Britannica Does Vaping Cause Second Hand Smoke V2 Cigs UK Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Vaping Slows Wound Healing Just as much as Smoking The Brink Boston University Health Risks of Secondhand Smoke and Aerosols Factsheet US EPA