Frontiers Nicotine free electronic vape fluid stimulates angiogenic processes in vitro through ARF6 mediated oxidative stress Differential effects of traditional cigarette, electronic cigarette, and tobacco heating product on human vascular smooth muscle cell phenotypic switch: A comparative functional perspective Atherosclerosis ESD Emergent constraints on transient climate response (TCR) and equilibrium climate sensitivity (ECS) from historical warming in CMIP5 and CMIP6 models Level and timing of product substitution in a trial of e cigarettes for smokers not interested in quitting