1. Annual smoking-attributable mortality, years of potential life lost, and productivity losses—U.S., 1997-2001;MMWR Morb Mortal Wkly Rep,2005
2. State estimates of total medical expenditures attributable to cigarette smoking, 1993;Miller;Public Health Rep,1998
3. The economic costs of drug abuse in the U.S., 1992–2002,2004