E cigarettes may be less harmful than regular cigarettes, but they aren't harmless. Here are a few of the risks of inhaling the aerosol or vapor a.k.a. vaping produced by e cigarettes: Vaping in the UK: A Comprehensive Analysis of its Impact on Respiratory Health Woodley BioReg Study: No Major Respiratory Symptoms Among Vapers Tobacco Reporter Vaping is linked to lung illness that sickens 11 in Indiana A Brief Guide to Vaping, Respiratory Health and Airway Treatment E cigarette use increases risk for developing major respiratory diseases