It may not be inhaled into the lungs, but smokeless tobacco exposes users to some of the same potent carcinogens as cigarettes. The discovery comes from the University of Minnesota Transdisciplinary Tobacco Use Research Center (TTURC).
TTURC researchers compared the urine of 182 oral snuff users with 420 cigarette smokers. They found that snuff users were exposed to higher levels of NNK, a carcinogen known to produce lung and pancreatic cancer. Stephen Hecht of the University of Minnesota Cancer Center led the research.