Adult Smoking in the U.S.
http://www.cdc.gov/VitalSigns/pdf/2011-09-vitalsigns.pdf
Reports that smoking among all adults declined 20.9% in 2005 to 19.3% in 2010 and the percentage of heavy smokers (those who smoke 30+ cigarettes per day) dropped from 13% in 2005 to 8% in 2010. Also provides smoking percentages by state. From the Centers for Disease Control and Prevention
