Quels sont les composants d'un liquide pour cigarette lectronique ? Propylne glycol (PG) dans la vape : rle, effets et scurit #JSV Tout comprendre sur le PG et le VG What's in an e liquid or vape juice? The main ingredients are propylene glycol (PG) and vegetable glycerine (VG). These are solvents that are basically used to dissolve and carry the other ingredients. 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