A ban on smoking in public places - including bars and restaurants - has started in Scotland.
Lots of people say the ban is a step forward in keeping people healthy, but some people are worried it might cost jobs and be against human rights.
A recent poll has also found out that one in five smokers in Scotland say they're going to ignore the ban.
It's the first place in the UK to bring in a ban. A similar ban is being brought in to England in 2007.
Northern Ireland is introducing a ban in April next year, while no date has been set yet in Wales.
Scotland's First Minister Jack McConnell said this was Scotland's "largest single step to improve its health for generations" and a day of pride for the nation.