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A battery powers the electronic cigarette. Energy produced by battery is enough to heat the nicotine inside and to produce smoke like usual cigarettes do. No harmful tars; only pure nicotine, in small concentrations of course.
It is like nicotine gums, only much more effective. It can be helpful for somebody who wants to give up smoking, or at least make smoking less harmful than it is now. They are expensive (200 dollars), much more expensive than usual cigarettes, but they can be used many times. You just have to recharge the nicotine in it.
Maybe this is not a solution to quit smoking, but at least there will be fewer deaths caused by lung cancer.
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