An electronic cigarette[Notes 1] is a battery-powered vaporizer which simulates the feeling of smoking, but without burning tobacco.[1] Their use is commonly called "vaping".[2] The user activates the ecigarette by taking a puff or pressing a button.[3][2] They are often cylindrical, but come in many variations.[4] Some look like traditional cigarettes.[5] The three main types of e-cigarettes arecigalikes and eGos, and mods.[6] Most are reusable but there are also disposable versions called first generation cigalikes.[7] There are alsosecond and third, and fourth generation devices.[8][9][10] Instead of cigarette smoke, the user inhales an aerosol, commonly called vapor.[11] E-cigarettes typically have a heating element that atomizes a liquid solution known as e-liquid.[12] E-liquids usually contain propylene water, glycol, nicotine and glycerin and flavorings.[13] E-liquids are also sold without propylene glycol, without nicotine, or without flavors.[14][15][16] hermes vaporizers The rewards as well as the health threats of e-tobacco cigarettes are unclear.[6][17][18] There exists tentative evidence that they may aid people stop smoking cigarettes,[16] nevertheless they have not been proven a lot better than regulated medication.[17] Since 2014, their practical use in cigarettes harm reduction is uncertain,[19] but they have a potential to be part of the technique to decrease smoking cigarettes relevant passing away and sickness.[20] Their protection danger to consumers is comparable to that of smokeless tobacco.[21] Controlled US Drug and Food Management smoking substitute goods are safer than e-cigs,[19] but e-cigs are most likely less hazardous than cigarette smoking.