The impact of electronic cigarettes on airway epithelial barrier integrity in preclinical mouse model American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society Juul Illegally Marketed E Cigarettes, F.D.A. Says The New York Times Research & Commentary: Cities and States Consider Increasing Tobacco Age Limit to 21, Regulating ENDS Like Tobacco Products The Heartland Institute Exposure to e cigarette advertising and young people's use of e cigarettes: A four country study