Level and timing of product substitution in a trial of e cigarettes for smokers not interested in quitting Differential effects of traditional cigarette, electronic cigarette, and tobacco heating product on human vascular smooth muscle cell phenotypic switch: A comparative functional perspective ScienceDirect Photometric Monitoring of Electronic Cigarette Puff Topography E Cigarettes induce expression of procoagulant tissue factor in cultivated human endothelial cells Journal of Thrombosis and Thrombolysis Springer Nature Link