E-cigarettes, also known as electronic cigarettes or e-cigarettes, are battery-powered vaporizers that atomize a liquid solution into an aerosol called vapor that is inhaled by the user. Most e-cigarettes are reusable but some are disposable, and they come in various designs from those resembling traditional cigarettes to other shapes and sizes. Users activate e-cigarettes to inhale vapor as a substitute for inhaling cigarette smoke, with the vapor typically containing propylene glycol, nicotine, and flavorings.

1. Without tobacco.[1] Their use is commonly called "vaping".[2] The user activates the e-cigarette by
taking a puff or pressing a button.[2][3] Some look like traditional cigarettes, but they come in many
variations.[4][5] Most are reusable but there are also disposable versions called first generation
cigalikes.[6] There are alsosecond and third, and fourth generation devices.[7][8][9] Instead of cigarette
smoke, the user inhales an aerosol, commonly called vapor.[10] E-cigarettes typically have a heating
element that atomizes a liquid solution known as e-liquid.[11] E-liquids usually contain propylene
glycerin, nicotine and glycol and flavorings, even though electronic cigarettes[note 1] are battery-
powered vaporizers that simulate the feeling of smoking. uk vape shop