The main components of an e-cigarette are a mouthpiece, a cartridge (tank), a heating element/atomizer, a microprocessor, a battery, and possibly a LED light on the end. The only exception to this are mechanical e-cigarettes (mods) which contain no electronics; the circuit is closed by a mechanical action switch. An atomizer comprises a small heating element, or coil, that vaporizes e-liquid and wicking material that draws liquid onto the coil.[90] When the user pushes a button, or (in some variations) activates a pressure sensor by inhaling, the heating element atomizes the liquid solution. The e-liquid reaches a temperature of roughly 100-250 °C within a chamber to create an aerosolized vapor, which the user then inhales, rather than cigarette smoke. The aerosol provides a flavor and feel similar to tobacco smoking.

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