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e-cigarette or electronic cigarette, a device that produces an aerosol from a liquid containing nicotine or another active ingredient, allowing it to be inhaled in a manner similar to smoking a cigarette. Generically known as an electronic nicotine delivery system, an e-cigarette consists of mouthpiece, a mechanism for heating the liquid to produce the aerosol, a tank that contains the liquid, a battery for powering the heating mechanism, and a on-off switch. Some e-cigarettes are disposable, but most have tanks that can be replaced or refilled and batteries than can be recharged. The e-cigarette is usually activated by a sensor that responds to user's sucking on the mouthpiece. Some e-cigarettes look like cigarettes, cigars, or pipes; others look like pens or USB flash drives; and others are not made to resemble something else. The liquid used in e-cigarettes, in addition to nicotine or other active ingredients, typically contains flavorings, preservatives, propylene glycol, and glycerol; the last two resemble smoke when exhaled. Vaping, instead of smoking, is the most common term used to describe inhaling the aerosol produced by an e-cigarette.

The modern e-cigarette was developed in China and first marketed in 2003, but similar devices were first proposed in the 1960s. Typically marketed as a smoke-free replacement for smoking or an aid for quitting smoking, they have become common since they were first introduced, and are often used to inhale an aerosol produced from liquids that do not contain nicotine; some users, for example, inhale the active ingredients in marijuana.

Although e-cigarettes have been marketed as healthier than cigarettes, because of the absence of tar and other carcinogenic products of burning, nicotine is a highly addictive, potentially hazardous substance. There is little evidence that e-cigarettes are useful for quitting smoking, and smokers who start using e-cigarettes may not stop smoking cigarettes. The use of flavorings but also the absence of combustion products has made vaping appealing to teenagers who have not previously smoked, leading to concerns about rising nicotine addiction in teenagers. Despite the lack of smoke, inhaling the aerosol an e-cigarette produces is potentially harmful. Cases of lung illness and some deaths have been associated with vaping; the devices themselves have sometimes exploded, often injuring (and in a few cases, killing) the user. The long-term effects of e-cigarrette use are unknown.

Regulation of the devices varies widely. A number of nations have banned e-cigarettes, but in other countries there are no regulations governing their use or sale. In the United States, the Food and Drug Administration did not assert regulatory authority over e-cigarettes until 2016, when it became illegal to sell e-cigarette products to persons under the age of 18. Additional regulations came into effect in 2019, and a ban on most flavored cartridge-based e-cigarettes was imposed in 2020, primarily to reduce the appeal of the devices to minors.

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(Electronic-CIGARETTE) A cigarette-shaped canister filled with liquid nicotine in various potencies. A vapor is inhaled, giving the person the satisfaction of a tobacco cigarette. The user's inhalation triggers the unit to heat and atomize the liquid into a vapor. Available in rechargeable and disposable varieties, a light glows when the unit is vaporizing.

Although many people use them to help quit or cut down on smoking, e-cigarettes are designed as a tobacco substitute, and vendors naturally want perpetual customers. For regular users, their advantage is twofold: they are healthier because there is no smoke and no tar, and secondly, people are able to use them in many venues where cigarettes are prohibited. Called "vaping" (for vaporizing), the various exhaled vapor aromas are mild, pleasing and nowhere near as unsavory to other people as is tobacco cigarette smoke.

The Liquid Content
Called "e-liquid," "e-juice" or "smoke juice," the liquid in an e-cigarette cartridge contains propylene glycol (PG) or vegetable glycerin (VG), both used as food additives, along with flavoring and nicotine. The propylene glycol is thinner than the vegetable glycerin and tends to keep the heating element cleaner; however, some people can be allergic to it. The vegetable glycerin causes fewer reactions, creates thicker plumes of vapor and provides a weaker throat hit. Some brands use a mixture of the two. See e-joint.

The blu Brand
Available in various flavors, glycerin-based blu brand cartridges last about as long as a pack of regular cigarettes. The batteries are rated at a thousand recharges and the tip glows blue when vaporizing.

With the charging adapter attached at the bottom, the popular JUUL unit looks more like a strange USB drive than an e-cigarette. At the top, the nicotine cartridge is inserted.
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References in periodicals archive ?
The FDA, though, has taken a more adversarial posture with the e-cig industry of late, demanding manufacturers come up with plans to limit teen access to the devices, then threatening to (https://www.fool.com/investing/2018/09/15/no-the-fdas-warning-was-not-good-for-e-cigs.aspx) remove all e-cigs from the market  if teen use doesn't fall.
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E-cigs contain far fewer cancer-causing and other toxic substances than cigarettes, however their long-term effects on health and nicotine dependence are unknown, researchers said.
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The main objective of the study was to assess the safety and effectiveness of e-cig among Malaysian vapers (e-cig users) for the duration of 1 month.
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Last year, Herzog forecast e-cig users will outnumber smokers by 2025, and she reiterated that view at the conference, noting recent trends providing impetus for the industry, including rapid sales growth, product innovations that help entice more people to switch from smoking to "vaping" and national e-cig rollouts by Big Tobacco companies that elevate the category and drive experimentation.
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