What is the least harmful vape? MONVAPER Propylene glycol is used in e cigarettes to produce a smoke like vapor. It's also used in anti freeze. Danger: Can cause eye, throat, and airway irritations. Visit our website to learn more about the Vaping can silently destroy your body, damaging multiple organs without you realizing it. Each puff delivers a mix of nicotine, propylene glycol, glycerin, heavy metals, and flavoring chemicals that slowly corrode your Ultrasonic Cigarettes: Chemicals and Cytotoxicity are Similar to Heated Coil Pod Style Electronic Cigarettes Chemical Research in Toxicology