Fact
Smokeless tobacco use causes oral cancer, lesions, and gum recession.
Source 1:
Nelson, D.E., et al. "Trends in Smokeless Tobacco Use Among Adults and Adolescents in the United States." American Journal of Public Health. 96(5). May 2006: 897–905.
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1470594