Some e cigarettes contain chemicals that cause popcorn lung Vox E cigarette flavorings may damage cilia production and function Harvard Gazette Common e cigarette chemical flavorings may impair lung function Harvard T.H. Chan School of Public Health Dr Farsalinos E Liquid Study Finds Diacetyl Present Frontiers The Evolving E cigarette: Comparative Chemical Analyses of E cigarette Vapor and Cigarette Smoke