A typical e-cigarette consists of an electrical heating element, known as an “atomizer”, a cartridge that contains a nicotine solution and a battery. Insider the atomizer, a metallic electrical heating coil is wound around a wick. The wick is saturated with the e-liquid. A sheath encases the coil–wick assembly and in turn a fibrous wool-like material envelopes the sheath. This wool-like material is soaked in the eliquid and acts as a reservoir for the wick.
The device is activated either by pressing a button or by an automatic pressure-sensitive sensor that detects the user inhaling.
When a user draws on the device, air is pulled from the end of the unit over the heated coil carrying away the e-liquid vapours. Before reaching the user, the vapour cools and condenses to form liquid droplets, thus, creating the visible plume of “smoke”.