Why are disposable vapes so popular? Allen Carr's Easyway Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Vaping Safety, Smoking, Dangers, Pros, Cons, Debate, E cigarettes, & Tobacco Britannica Evidence Mounts About the Health Impact of Second Hand Vaping Bisnar Chase Research examines whether vaping can 'entrench' smoking habits in teenagers The Independent