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An electric cigarette [notes is an electronic device that replicates tobacco smoking cigarettes. It includes an atomizer, a source of power such as a battery, and a container such as a cartridge or tank. Rather of cigarette smoke, the user breathes in vapor, so utilizing an e-cigarette is called "vaping". The atomizer is a heating component that atomizes a liquid solution called e-liquid.  E-cigarettes are activated by taking a puff or pressing a button. Some look like conventional cigarettes. A lot of variations are multiple-use.
E-cigarettes develop an aerosol, frequently called vapor, made from particulate matter. The vapor typically contains propylene glycol, glycerin, nicotine, flavors, and traces of toxicants, carcinogens,  heavy metals, and metal nanoparticles. Its exact composition varies, and depends on several factors including user behavior.
The health effects of e cigarettes are unknown,  but they are likely less harmful than smoking tobacco. E-cigarette vapor consists of less harmful chemicals, in lower concentrations, than cigarette smoke. It does consist of harmful chemicals, including hazardous chemicals not found in tobacco smoke.
Nicotine is harmful and highly addictive. Young people are particularly susceptible to this, and most (90%) smokers start prior to the age of 18. Among novice users of individuals who attempt nicotine become addicted.  People who vape are more likely to start smoking. For smokers, the best advice is to quit, preferably utilizing smoking cessation therapy such as NRT. Nevertheless, for those cigarette smokers who are not able or reluctant to quit using conventional NRT, vaping has a role in tobacco damage decrease.
An electric cigarette includes an atomizer, a power source such as a battery, and a container for the e-liquid such as a cartridge or tank.
First-generation e-cigarettes tend to look like traditional cigarettes, though there is some variation in size, and so are called "cigalikes". Second-generation gadgets are bigger general and look less like conventional cigarettes. Third-generation devices include mechanical mods and variable voltage devices.  The fourth-generation consists of Sub ohm tanks (significance that they have electrical resistance of less than 1 Ohm) and temperature level control devices. The voltage for first-generation e-cigarettes is about and second-generation e-cigarettes can be adjusted from 3 V to 6 V, while more current gadgets can go up to 8 V. There are also pod mod devices that utilize protonated nicotine, instead of free-base nicotine discovered in earlier generations, providing higher nicotine yields through the production of aerosolized protonated nicotine.
E-liquid is the mix utilized in vapor items such as e-cigarettes. It typically contains propylene glycol, glycerin, nicotine, flavorings, additives, and impurities. E-liquid formulations vary widely. A typical e-liquid consists of propylene glycol and glycerin (95%), and flavorings, nicotine, and other ingredients (5%). Some e-liquids do not have propylene glycol, website  nicotine, or flavors.The flavorings may be natural, artificial, or organic.Over 80 chemicals such as formaldehyde and metallic nanoparticles have been discovered in the e-liquid. There are numerous e-liquid producers, and more than 15,000 flavors. 
In the United States, under Fda (FDA) guidelines, e-liquids need to abide by making standards.Industry requirements are released by the American E-liquid Production Standards Association (AEMSA). EU requirements are in the EU Tobacco Products Directive.
Lots of users start with a disposable e-cigarette resembling a tobacco cigarette.   They typically advance to later-generation devices and might change their gadgets to offer more vapor.Experienced users frequently prefer rechargeable e-cigarettes.  Women choose non reusable e-cigarettes, and young people pay more attention to modifiability. Modifiability increases the chance of beginning vaping amongst youths.
Many vapers use a refillable tank system, permitting them to blend their own liquid giving control over taste and strength.Experienced vapers rank customizability as the most essential consideration in choosing a gadget. Users ranked nicotine strength as an essential factor for picking among various e-cigarettes, though such choice might vary by smoking cigarettes status, e-cigarette usage history, and gender.Non-smokers and inexperienced e-cigarettes users tended to prefer no nicotine or low nicotine e-cigarettes while cigarette smokers and knowledgeable e-cigarettes users preferred medium and high nicotine e-cigarettes.