Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times We were shocked': Vaping considerably increases lung cancer risk among people who smoke Second hand e cigarette vapour increases risk of poor respiratory health, study finds Nursing in Practice Health Risks of Secondhand Smoke and Aerosols Factsheet US EPA Are Electronic Cigarettes a Gateway to Tobacco Use? New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking