Alternatives to smoking Evapo Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link Vaping is NOT safer than smoking! It's time to debunk the myths surrounding vaping. Many think e cigarettes are a harmless alternative to traditional cigarettes, but research indicates otherwise. Vaping can still Propylene Glycol in E Cigarettes Is PG Dangerous to Inhale? E Cigarette Direct Determination of Thermal Decomposition Products Generated from E Cigarettes Chemical Research in Toxicology