Ultrasonic Cigarettes: Chemicals and Cytotoxicity are Similar to Heated Coil Pod Style Electronic Cigarettes Chemical Research in Toxicology Le propylne glycol peut il tre dangereux pour la sant ? CigaretteElec The Hidden Dangers of E Cigarettes David Perlmutter M.D. 1,2 Propylene Glycol: A Biomarker of Exposure Specific to e Cigarette Consumption E cigarettes gain attention in schools amid rise in popularity The Washington Post E cigarettes aren't harmless, and combining them with cigarettes makes them even worse Study Summary