PG - You will see this abbreviation used with some
e-liquid sellers, and across the forum, it stands for Propylene Glycol. See 'What is in the e-liquid' under 'Personal Vaporizing Liquids' further down this FAQ.
VG - You will see this abbreviation used with some e-liquid sellers and across the forum, it stands for Vegetable Glycerine. See 'What is in the e-liquid' under 'Personal Vaporizing Liquids' further down this FAQ.
PEG (400) - You will see this abbreviation used with some e-liquid sellers and across the forum, it stands for "PolyEthylene Glycol", and the "400" relates to its molecular weight. Not to be confused with Ethylene Glycol, which is poisonous, PEG is fully approved for pharmaceutical use and is used in a variety products like mouthwash, cosmetics and foods. See 'What is in the e-liquid' under 'Personal Vaporizing Liquids' further down this FAQ.