This lung damage from e cigarettes is permanent and entirely preventable. Flavored e cigarettes, often marketed with candy like appeal, may be far more dangerous than they seem. A recent case involving a U.S. Yes, vaping is toxic and the consequences can be permanent. A U.S. teenager developed popcorn lung a life altering, incurable condition after secretly vaping flavored e cigarettes for Protein thiol oxidation in the rat lung following e cigarette exposure ScienceDirect Rethinking Vaping Pulmonary Illness Related to E Cigarette Use in Illinois and Wisconsin Final Report New England Journal of Medicine