Base Nicotine pour cigarette lectronique Naturacig 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 CannabidiolA friend or a foe? ScienceDirect 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. Characterizing the degradation of cannabidiol in an e liquid formulation Scientific Reports Easy and Accessible Synthesis of Cannabinoids from CBD Journal of Natural Products