The flavoring chemicals in e cigarettes are linked to a disease known as popcorn lung Flavor induced inflammation and cytotoxicity in human aortic smooth muscle cells: Potential implications for E cigarette safety ScienceDirect Vaping and Electronic Cigarette (E Cigarette) Products Cattaraugus County Website New HRB paper examines the value and safety of electronic cigarettes as a smoking cessation intervention HRB Health Research Board Addressing the challenges of E cigarette safety profiling by assessment of pulmonary toxicological response in bronchial and alveolar mucosa models Scientific Reports