Are there harmful chemicals in smokeless tobacco?
Yes. There is no safe form of tobacco. At least 28 chemicals in smokeless tobacco have been found to cause cancer (1). 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) (1).