Don't Be Fooled: Vaping Is Just as Dangerous as Cigarettes How to talk to youth about vaping: Information and resources from the district and partners Is Biobased Propylene Glycol Safe TikTok PROPYLENE GLYCOL AND VEGETABLE GLYCERINE to Create your Electronic Cigarette Liquids 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.