Vaping Glossary and Terminology

Propylene Glycol (PG)

One of two main substances used in the making of e-cigarette liquids. An organic glycerol made from propylene oxide, a petroleum byproduct. It is used in a wide variety of products including solvents, chemical additives, and many medical and pharmaceutical personal care products. The U.S. Food and Drug Administration (FDA) has classified PG juice under the “Generally Recognized As Safe” designation.


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