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What is smokeless tobacco?

Smokeless tobacco is tobacco that is not burned. It is also known as chewing tobacco, oral tobacco, spit or spitting tobacco, dip, chew, and snuff. Most people chew or suck (dip) the tobacco in their mouth and spit out the tobacco juices that build up, although “spitless” smokeless tobacco has also been developed. Nicotine in the tobacco is absorbed through the lining of the mouth.

The National Cancer Institute states “there are at least 28 chemicals in smokeless tobacco have been found to cause cancer. The most harmful chemicals in smokeless tobacco are tobacco-specific nitrosamines, which are formed during the growing, curing, fermenting, and aging of tobacco. The level of tobacco-specific nitrosamines varies by product. Scientists have found that the nitrosamine level is directly related to the risk of cancer.”

In addition to a variety of nitrosamines, other cancer-causing substances in smokeless tobacco include polonium–210 (a radioactive element found in tobacco fertilizer) and polynuclear aromatic hydrocarbons (also known as polycyclic aromatic hydrocarbons).

http://www.mayoclinic.com/health/chewing-tobacco/CA00019/NSECTIONGROUP=2gunkygums