Differential effects of traditional cigarette, electronic cigarette, and tobacco heating product on human vascular smooth muscle cell phenotypic switch: A comparative functional perspective ScienceDirect Acute exposure to e cigarettes causes inflammation and pulmonary endothelial oxidative stress in nonsmoking, healthy young subjects American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society Frontiers Nicotine free electronic vape fluid stimulates angiogenic processes in vitro through ARF6 mediated oxidative stress Level and timing of product substitution in a trial of e cigarettes for smokers not interested in quitting