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. Can you mix CBD oil with e liquid? SupremeCBD CBD Containing Liquids for e Cigarettes: Formation of Psychotropic and Secondary Cannabinoids and Amount of CBD Surviving the Smoking Procedure Propylene glycol based green extraction of polyphenols from industrial hemp stems: process optimization and bioactivity assessment Chemical and Biological Technologies in Agriculture Springer Nature Link