Frontiers The Chemical Complexity of e Cigarette Aerosols Compared With the Smoke From a Tobacco Burning Cigarette Ask an Expert Youth Vaping: What You Need to Know USU Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link E Liquide Menthe : Arme, Saveur, Got Menthe Pour E Cigarette E liquide Menthe Polaire Fabriqu en France The Role of ROS in Electronic Cigarette and Heated Tobacco Product Induced Damage