VG stands for Vegetable Glycerin. It is a natural chemical, derived from vegetable oil, so is safe for vegetarians. It is commonly used in e-liquid to give a ‘thick’ sensation to vapour. VG has a slightly sweet taste and is considerably thicker than PG. So:higher VG / lower PG will be a thicker liquidhigher PG / lower VG will be a thinner liquid PG stands for Propylene Glycol. The fluid has no odour or colour, and is less viscous than VG. In vaping it is used to provide a ‘throat hit’, which some users claim is similar to the sensation experienced when smoking tobacco. It also carries flavour more effectively than VG, meaning it’s the most commonly used suspension fluid for flavour concentrates and nicotine.