I'm going to step into Anti-Strib's realm here. The folks over there have posted numerous stories about the adverse effects of the smoking ban that Hennepin and Ramsey counties instituted this year. According to this story in today's Star Tribune, charitable gaming revenues are down 22% in Hennepin county for the 2nd quarter of 2005 (the last quarter reported) and Ramsey county is down 10%. Metro counties (where there is no ban) are more mixed with a few counties gaining minimal revenue and others loosing minimal revenue. This should surely add to the pressure to both counties to reconsider their smoking bans.
This adds to the economic bad news that the smoking bans have brought to the counties. I would encourage you to go read the archives over at Anti-Strib. They have put a ton of research into this and they deserve all the credit for keeping this issue front and center.