Dr Farsalinos E Liquid Study Finds Diacetyl Present Health Effects of Vaping Smoking and Tobacco Use CDC E cigarette flavorings may damage cilia production and function Harvard Gazette It may look trendy, but vaping is silently damaging your lungs. Behind the flavored puffs lie chemicals like diacetyl known to scar and narrow your airways permanently. The damage leads Common e cigarette chemical flavorings may impair lung function Harvard T.H. Chan School of Public Health