New medical research is raising concerns about possible links between vaping and bronchiolitis obliterans also known as popcorn lung, a rare and irreversible lung disease. Health experts say more long term Flavor induced inflammation and cytotoxicity in human aortic smooth muscle cells: Potential implications for E cigarette safety ScienceDirect E cigarette Characteristics, Safety Issues, & Regulation Britannica E Cigarette Additives Can Impair Lung Function, Finds Study Electronic cigarettes cause much less inflammation than tobacco Prevention Observatory of the Montreal Heart Institute