Do you know what you're vaping? Propylene glycol (PG) and vegetable glycerin (VG) are the main liquids in vapes. When heated, these chemicals turn toxic and aren't safe to breathe. Chemical Composition of Aerosols from the E Cigarette Vaping of Natural and Synthetic Cannabinoids Chemical Research in Toxicology CBD Containing Liquids for e Cigarettes: Formation of Psychotropic and Secondary Cannabinoids and Amount of CBD Surviving the Smoking Procedure Easy and Accessible Synthesis of Cannabinoids from CBD Journal of Natural Products