Health risks of Smokeless Tobacco. American Cancer Society. http://www.cancer.org/cancer/cancercauses/tobaccocancer/smokeless-tobacco. Last modified 11/13/15. Accessed 6/30/16.
Smokeless Tobacco: Health Effects, Smoking & Tobacco Use. Centers for Disease Control and Prevention. https://www.cdc.gov/tobacco/data_statistics/fact_sheets/smokeless/health_effects/. Last modified 11/4/14. Accessed 6/30/16.
National Institutes of Health. Smokeless Tobacco: A Guide for Quitting, National Institute of Dental and Craniofacial Research. http://www.nidcr.nih.gov/oralhealth/Topics/SmokelessTobacco/SmokelessTobaccoAGuideforQuitting.htm. Last modified 8/2012. Accessed 6/30/16.
US Dept of Health & Human Services. Smokeless Tobacco Products. BeTobaccoFree.gov.
http://betobaccofree.hhs.gov/about-tobacco/smokeles-tobacco/. Accessed 6/30/16.
Frances R, Miller S, Mack A. Clinical Textbook Of Addictive Disorders, 3rd Ed. New York: Guilford Press; 2011.