Fact
In 2010, 52.4% of U.S. smokers quit for at least a day.
Source 1:
"Quitting Smoking Among Adults --- United States, 2001--2010." CDC. 11 Nov. 2011. 60(44): 1513-1519. Web.
http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6044a2.htm?s_cid= mm6044a2.htm_w