1. http://www.cdc.gov/tobacco/data_statistics/state_data/data_highlights/2006/00_pdfs/DataHighlights06rev.pdf
2. http://www.monitoringthefuture.org/data/07data.html#2007data-cigs
3. Healthy People 2010,2002
4. NCI Smoking and Tobacco Control Monograph 14: Changing Adolescent Smoking Prevalence,2001
5. CDC National Youth Tobacco Survey—United States, 2000;Morbidity and Mortality Weekly Report November 2,2001