But there is no evidence as yet that smokers have given up smoking in huge numbers because of the legislation.
While overall levels of smoking among adults in Great Britain remained constant at 21% between 2007 and 2009, the north east of England saw a different trend.
There, the smokefree ban proved to be a trigger for some adults to quit with the largest drop in smoking in England - from 29% in 2005 to 27% in 2007 and down to 21% by 2011.
Smokers' groups say the ban has been a disaster for many pubs and clubs and the impact on many people's social lives has been huge.
No smoking sign
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A total ban on smoking in cars and in public spaces where children are present has been suggested
Simon Clark, director of smokers' lobby group Forest, said smokers were being forced to take their habit elsewhere.
"Thanks to the ban many smokers are smoking and drinking at home. Who can blame them when the alternative is standing outside in the wind and rain?"
Calling for a comprehensive review of the impact of the smoking ban, he said: "We want the government to amend the legislation to allow separate, well-ventilated smoking rooms in pubs and clubs. Few people would object to that because no-one would be exposed to other people's smoke against their wishes.