A total ban on smoking in public places, including bars and restaurants, has entered into force in Scotland.
The ban has been hailed as a step forward for better health but critics say it will cost jobs and also infringe human rights.
More than a fifth of smokers questioned in Scotland plan to flout the ban, which came into effect early on Sunday. The impact will be watched closely in England, Wales and Northern Ireland, where bans have also been approved.
In February MPs voted in favour of a total ban on smoking in enclosed public spaces in England, which is due to come into effect in the summer of 2007.
Bulgaria has also introduced a partial ban on smoking, obliging owners of bars and restaurants to provide for separate smoker and non-smoker spaces.