 Figures from 2013 show that proportion of the British population (UK excluding Northern Ireland) who smoke has fallen to 19%.According to the CDC, as of 2015, a total of 15.1% of U.S. adults (16.7% of men and 13.6% of women) smoke, which is down from 20.9% a decade earlier.Of U.S. smokers in 2005, 80.8% (or 36.5 million) smoked every day, and 19.2% (or 8.7 million) smoked some days.