Electronic cigarettes are an alternative to cigarettes, delivering nicotine without burning tobacco. The electronic cigarette, smokeless cigarette, or personal vaporizer, vaporizes a nicotine solution contained in a chamber, with a heating element which is activated either by a sensor in the mouthpiece, or by pressing a button. The vaporizer contains micro-electronic sensors that atomize the nicotine solution when activated. The shape is most often that of a cigarette, although they are also available in the shape of a ballpoint pen.
Electronic cigarettes are designed to give the user the sensation of smoking a tobacco cigarette. The tip of an electronic cigarette glows when activated, as does a traditional cigarette. The LED at the tip is available in many colours. The cartridge containing the nicotine solution is designed to look like a filter. The electronic cigarettes are also available in several lengths, to resemble the lengths available in traditional cigarettes. The vapor produced resembles tobacco smoke but has no odor. The cartridge that contains the nicotine solution will last as long as fifteen or twenty tobacco cigarettes.
The electronic cigarette can be used anywhere as there is no smoke, ash and additives. Most are rechargeable and can be recharged either through a household AC outlet, or a USB port on a computer. The nicotine solution is available in a variety of flavours; fruit, mint, coffee, toffee. The amount of nicotine in the solution also varies, as do cigarettes; regular, light, ultra-light. There are also formulations available that contain no nicotine. No tars or carbon monoxide or second-hand smoke are produced because tobacco is not being burned. The nicotine is formulated in a propylene glycol or glycerin base. These are both non-toxic and have no adverse health effects.
The electronic cigarette is marketed as an alternative to smoking cigarettes, not as a cessation device. Because nicotine is the product delivered, they are intended to be used by smokers, not non-smokers or children. They have been approved for import and sale in many countries around the world. In North America, they have not been approved yet, as the US Food and Drug Administration has objected that the delivery of nicotine is not regulated sufficiently to avoid nicotine poisoning, and Health Canada has issued a warning that the products could lead to nicotine poisoning and addiction. Most electronic cigarettes have a sensor that will turn the unit off if more than a certain number of inhalations are taken in a short period of time, to eliminate the possibility of over-delivery of nicotine. Electronic cigarettes are a novel and less expensive alternative to tobacco.

