Propylene Glycol Detection in Saliva of Vape Users Using GCMS LCGC International How to Understand Vaping's Dangers RSDC Researchers at the University of California, Riverside, found that heating propylene glycol, the main ingredient in most e cigarette liquids, can produce two toxic chemicals, methylglyoxal and acetaldehyde, which damage lung cells. Using 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 What is Propylene Glycol in Vape? Crystal Vape & Crystal Bar & SKE Vape Official Station