High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Tobacco-specific nitrosamines is one of the most important groups of carcinogens in tobacco products, particularly cigarettes and American style (fermented) dipping snuff. These nitrosamine carcinogens are formed from nicotine and related compounds by a nitrosation reaction that occurs during the curing and processing of tobacco. They are called tobacco-specific nitrosamines because they are found only in tobacco products (and possibly in some other nicotine-containing products). Thus the tobacco-specific nitrosamines are present in both "smokeless" tobacco products such as dipping tobacco and in cigarette smoke. They are present to a significantly less degree in snus, a Swedish style snuff that is not fermented and is pasteurized. They have been detected in American style "smokeless" tobacco products, but Health New Zealand concluded, in their study, that carcinogens and toxicants were present only below harmful levels. They are among the most important carcinogens in cigarette smoke, along with combustion products and other carcinogens.

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