Following are the cancers that the ACS claims, with no supporting data, are caused by smokeless
tobacco use, followed by the actual scientific evidence derived from the most comprehensive study ever published (read about it here).
http://rodutobaccotruth.blogspot.com/2009/08/cancer-risks-from-smokeless-tobacco-use.html
American Cancer Society ................Claim Actual Scientific Evidence
Mouth, tongue and throat cancer ......Not significantly elevated, RR = 1.07 (CI = 0.84-1.37)
Esophagus cancer .........................Not significantly elevated, RR = 1.13 (CI = 0.95-1.36)
Stomach cancer ...........................Not significantly elevated, RR = 1.03 (CI = 0.88-1.20)
Pancreatic Cancer ........................Not significantly elevated, RR = 1.07 (CI = 0.71-1.60)
RR = Relative Risk.
Scientific evidence shows clearly that smokeless
tobacco use only slightly elevates cancer risks, if at all. The reported elevations are so small that they are not statistically significant; in other words, they may have occurred purely by chance. It is also important to point out that small RRs (those under 2) should not be seen as reliable. The National Cancer Institute advises: “Relative risks or odds ratios less than 2 are viewed with caution,” because they “are sometimes difficult to interpret.”
Tobacco Truth: Cancer Risks from Smokeless Tobacco Use: Next To Nil