1. Centers for Disease Control and Prevention 2012 Smoking and Tobacco Use: Adult Cigarette Smoking in the United States: Current Estimate http://www.cdc.gov/tobacco/data_statistics/fact_sheets/adult_data/cig_smoking/
2. Centers for Disease Control and Prevention 2012 Smoking and Tobacco Use: Tobacco-Related Mortality http://www.cdc.gov/tobacco/data_statistics/fact_sheets/health_effects/tobacco_related_mortality/index.htm
3. Centers for Disease Control and Prevention 2012 Smoking & Tobacco Use: Smoking Cessation http://www.cdc.gov/tobacco/data_statistics/fact_sheets/cessation/quitting/index.htm
4. Tobacco Control