The evidence is clear: Young E cigarette users suffer from respiratory symptoms American Lung Association Flavor induced inflammation and cytotoxicity in human aortic smooth muscle cells: Potential implications for E cigarette safety ScienceDirect What is an E Cigarette or Electronic Cigarette? Addressing the challenges of E cigarette safety profiling by assessment of pulmonary toxicological response in bronchial and alveolar mucosa models Scientific Reports Young users of electronic cigarettes exhibit reduced cardiorespiratory fitness Journal of Applied Physiology American Physiological Society