Various types of electronic cigarettes.

An electronic cigarette (or e-cigarette, e-cig), also known as a vape, is a cigarette substitute. It gives small amounts of the chemical nicotine without the tobacco or other chemicals from real cigarettes.

The main substances making up in the liquid in the e-cigarettes are nicotine, propylene glycol, glycerin and some flavors or smells. Using an e-cigarette is known as "vaping".