PG and VG are two common base ingredients in e liquids for electronic cigarettes, playing crucial roles in various vaping products. Let's explain their meanings using simple and understandable Ge Gou 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. Vape Fluid Warps The Skulls of Fetal Mice, Study Shows : ScienceAlert Goondiwindi 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. PG VG Bases Custom DIY E liquid Mix for Throat Hit & Vapor Propylene Glycol Vape Juice Amazon.com: Vegetable Glycerine & Propylene Glycol Base VGPG 70 30