Electronic cigarettes come in different sizes and shapes that often mimic conventional cigarettes. Common e-cigarette components include: a liquid solution, a cartridge, an atomizer (vaporizer and cartomizer), and a power source (rechargeable battery and internal electronic circuit). Many e-cigarettes are made up of replaceable parts, while single-use devices combine all the components into a single part that is discarded when the e-liquid runs out. The refill packs of the cartridges vary in price according to the quantity of nicotine declared (generally, between 6 and 24 mg/ml; in Italy, a nicotine content not exceeding 20 mg/ml is permitted). Some models contain no nicotine, just a flavored vapor. Cartridge Generally, the cartridge of the electronic cigarette serves both as a reservoir of e-liquid, and from filter. The solution contained in it can be formulated with different concentrations of nicotine (high, medium, low or absent) in a mixture composed of water, propylene glycol, glycerol and other substances, including flavorings that simulate the taste of tobacco or reproduce a wide range of flavors (example: mint, vanilla, chocolate, tobacco, fruit, etc.). The cartridge of the e-cigarette is designed to allow the liquid to pass into the atomizer and the vapor to the user’s mouth. When the liquid runs out, users can refill or replace the cartridge. One refill is equivalent to around 7-25 regular cigarettes, depending on the nicotine content, but how long it lasts obviously depends on how you use the device. Atomizer The atomizer is the central component of the electronic cigarette. It generally consists of a small heating element responsible for vaporizing the liquid. Power of the Electronic Cigarette Most portable vaping devices contain a rechargeable battery, which tends to be the largest component of an e-cigarette. The battery may contain an electronic flow sensor that is activated simply by inhaling through the device, while other models use a power button that must be held during operation. An LED may also be employed to indicate activation. Some manufacturers also offer a portable cigarette pack-shaped refill that holds a larger battery. Accessories Depending on the type, the electronic cigarette can have additional functions and support a wide range of internal batteries, accessories and atomizers.

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