An electronic cigarette [notes is an electronic gadget that imitates tobacco smoking cigarettes. It consists of an atomizer, a power source such as a battery, and a container such as a cartridge or tank. Instead of cigarette smoke, the user inhales vapor, so using an e-cigarette is called "vaping". The atomizer is a heating element that atomizes a liquid service 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 particle matter. The vapor normally consists of propylene glycol, glycerin, nicotine, flavors, and traces of toxicants, carcinogens,  heavy metals, and metal nanoparticles. Its specific composition differs, and depends on several factors including user behavior.
The health effects of e cigarettes are unknown,  but they are likely less harmful than cigarette smoking tobacco. E-cigarette vapor contains fewer harmful chemicals, in lower concentrations, than cigarette smoke. It does contain harmful chemicals, including harmful chemicals not found in tobacco smoke.
Nicotine is toxic and highly addicting. Youths are especially prone to this, and the majority of (90%) cigarette smokers begin prior to the age of 18. Amongst novice users of people who try nicotine end up being addicted.  Individuals who vape are more likely to begin smoking cigarettes. For cigarette smokers, the finest recommendations is to stop, preferably using cigarette smoking cessation therapy such as NRT. However, for those smokers who are not able or reluctant to give up utilizing traditional NRT, vaping has a role in tobacco harm reduction.
An electronic cigarette includes an atomizer, a source of power such as a battery, and a container for the e-liquid such as a cartridge or tank.
First-generation e-cigarettes tend to appear like conventional cigarettes, though Additional reading there is some variation in size, and so are called "cigalikes". Second-generation devices are larger overall and look less like standard cigarettes. Third-generation gadgets consist of mechanical mods and variable voltage devices.  The fourth-generation includes Sub ohm tanks (meaning that they have electrical resistance of less than 1 Ohm) and temperature level control gadgets. The voltage for first-generation e-cigarettes has to do with and second-generation e-cigarettes can be changed from 3 V to 6 V, while more recent devices can increase to 8 V. There are likewise pod mod gadgets that use protonated nicotine, rather than free-base nicotine found in earlier generations, supplying greater nicotine yields through the production of aerosolized protonated nicotine.
E-liquid is the mix used in vapor products such as e-cigarettes. It usually consists of propylene glycol, glycerin, nicotine, flavorings, ingredients, and pollutants. E-liquid formulations vary widely. A typical e-liquid makes up propylene glycol and glycerin (95%), and flavorings, nicotine, and other additives (5%). Some e-liquids do not have propylene glycol,  nicotine, or flavors.The flavorings might be natural, synthetic, 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 US, under Fda (FDA) guidelines, e-liquids must comply with making standards.Industry requirements are published by the American E-liquid Manufacturing Standards Association (AEMSA). EU requirements remain in the EU Tobacco Products Regulation.
Many users start with a non reusable e-cigarette resembling a tobacco cigarette.   They often advance to later-generation gadgets and may adjust their gadgets to offer more vapor.Experienced users often choose rechargeable e-cigarettes.  Ladies prefer disposable e-cigarettes, and young grownups pay more attention to modifiability. Modifiability increases the possibility of starting 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 crucial factor to consider in picking a gadget. Users ranked nicotine strength as a crucial element for choosing amongst different e-cigarettes, though such preference might differ by smoking status, e-cigarette usage history, and gender.Non-smokers and unskilled e-cigarettes users tended to prefer no nicotine or low nicotine e-cigarettes while cigarette smokers and skilled e-cigarettes users preferred medium and high nicotine e-cigarettes.