Second hand e cigarette vapour increases risk of poor respiratory health, study finds Nursing in Practice Vaping substantially less harmful than smoking, largest review of its kind finds King's College London E Cigarettes (Vapes) Smoking and Tobacco Use CDC Secondhand Electronic Cigarette Aerosol and Indoor Air Quality US EPA Vaping Impairs Vascular Function, Even Without Nicotine, Study Finds New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking