Adolescents who use smokeless tobacco are more likely to become cigarette smokers.
"Preventing Tobacco Use Among Young People: A Report of the Surgeon General." U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevetion, National Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health. 17. Web.http://profiles.nlm.nih.gov/NN/B/C/F/T/_/nnbcft.pdf