Electronic cigarettes often contain nicotine. But the vast difference lies in the amount of nicotine: 3.36 mg/day for e-cigarettes versus 14-21 mg/day for traditional cigarettes. This means you can smoke an e-cigarette for about a week to intake as much nicotine as most smokers do in a day.
Dr. Michael Siegela, a physician who specializes in preventative medicine, noted  that the nitrosamine levels found in tobacco products are 300 to 1400 times higher than the amounts found in electronic cigarettes. In fact, e-cigarettes contain no more nitrosamine than that found in any nicotine replacement products, like the famous NicoDerm CQ.
The best e-cigarettes allow you to customize the exact amount of nicotine in the cartridge, including the option to include no nicotine at all. Cigarti is a brand that allows this kind of full customization, from nicotine levels to special flavoring.
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Cigarettes kill more people each year than any other drug. This could be a compelling reason for many to ban cigarettes from the market. Indeed, this seems to be the direction America is headed, with bans taking place in bars, restaraunts, and college campuses. Actually, smokers are really being pushed out of every public place and expected to smoke in the privacy of thier homes.
I don't think we should expect a national ban on cigarettes. A general ban would not make people quit smoking, it would only make it even more difficult for consumers to purchase cigarettes. What seems more likely is more of what is already happening-- a gradual government effort to discourage smoking. People are being pushed away from smoking by localized bans, yes, but also by huge taxation. Advertising for cigarettes have also been highly regulated. These measures have been exceedingly effective at cutting down smoking in the country. We will probably see more similar measures taken to discourage more folks from smoking. Consumers are going to be forced into exploring alternatives to satisfy their needs, such as electronic cigarettes, smokeless tobacco, and nicotine replacement therapy.

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