Roughly 33% of adults world-wide, 23% in the US, 22% in Canada.

Older table: http://www.nationmaster.com/graph/he...-adult-smokers ;the 0 numbers are a "unkown" indicator, I can attest that there are indeed smokers in Honduras.

You probably don't notice smokers in the US because they have been hounded out of the places you go. They can be found lurking in dark alleys along with the child molesters .