Electronic cigarettes are battery-operated devices. People use them to inhale an aerosol, which typically contains nicotine, flavorings, and other chemicals. In many e-cigarettes, puffing activates the battery-powered heating device, which vaporizes the liquid in the cartridge or reservoir. The person then inhales the resulting aerosol or vapor (called vaping).
Nicotine stimulates the adrenal glands to release the hormone epinephrine (adrenaline). It increases the levels of a chemical messenger in the brain called dopamine. Pleasure caused by nicotine’s interaction with the brain’s reward system motivates some people to use nicotine regularly. However there are possible risks to their health and well-being.
Research so far suggests that e-cigarettes are less harmful than cigarettes when people who regularly smoke switch to them as a complete replacement. But e-cigarettes can still damage a person’s health.
E-cigarette use also exposes the lungs to a variety of chemicals, including those added to e-liquids, and other chemicals produced during the vaporizing process. In overall, some people consider a little smoking during the day healthy.

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