Vape juice, also known as e-liquid or e-juice, is a liquid substance that is used in e-cigarettes and vaporizers. When heated by the atomizer in an e-cigarette or vaporizer, the e-liquid is vaporized, producing a flavored aerosol that can be inhaled.

Vape juice is typically made from a mixture of propylene glycol and/or vegetable glycerin, which serve as the base for the liquid, as well as food-grade flavorings and, in some cases, nicotine. The composition of the e-liquid can vary greatly, with some liquids containing high levels of nicotine and others being nicotine-free.

There are many different types and flavors of vape juice available, including fruit flavors, dessert flavors, menthol flavors, and tobacco flavors, among others. The flavor and overall vaping experience can vary greatly depending on the quality of the ingredients used and the manufacturing process.