The application of in vitro cellular assays for analysis of electronic cigarettes impact on the airway ScienceDirect Lung cancer cells protected from cigarette smoke damage, researchers find Penn State University E Cigarettes and Lung Health American Lung Association The rise of electronic nicotine delivery systems and the emergence of electronic cigarette driven disease American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society Flavour chemicals in e cigarettes could damage lung tissue CBC Radio