Experts warn that flavored e cigarettes can cause irreversible lung damage, as seen in a U.S. teenager who developed "popcorn lung"a severe and permanent condition called bronchiolitis obliteransafter secretly vaping for three years. Some e cigarette flavors contain chemical linked to 'popcorn lung' disease The Verge Broad range of studies show e cigs increase lung disease risk by 40 50% Stanton Glantz blog The Toxic Chemical Causing Lung Disease Among Both Workers Making and Users Vaping E Cigarettes In These Times Vapotage : ces nouvelles puffs , vendues sur Internet, qui ressemblent des smartphones Le Monde du Tabac