E-liquid, also known as vape juice, is the liquid used in vape kits and e-cigarettes to produce flavored vapor. It typically consists of three main ingredients: vegetable glycerine, propylene glycol, and flavorings. Many e-liquids also contain nicotine, though nicotine-free options are available. There are various types of e-liquids, and understanding the differences can help you choose the right one for your device