1. Centers for Disease Control and Prevention Lung and bronchus cancer incidence rates by state 2009 http://www.cdc.gov/cancer/lung/statistics/state.htm
2. Centers for Disease Control and Prevention Division for heart disease and stroke prevention: data trends and maps [no date] http://apps.nccd.cdc.gov/NCVDSS_DTM/#
3. Farrelly MC Nimsch CT Impact of cigarette excise tax increase in low-tax southern states on cigarette sales, cigarette excise tax revenue, tax evasion, and economic activity: final report. Prepared for Tobacco Technical Assistance Consortium 2003