In a city just to the south of mine (Appleton, WI, for anyone who needs to know) a controversial smoking ban was just passed in April. A referendum was voted down a couple times before, but this time it's finally passed, and it just took effect last Friday, July 1. The first night, there was a lot of complaining, and there's still a lawsuit against the city trying to fight it, but right now it looks like it's going to stand up. It's one of the strongest bans in the nation, basically affecting anywhere where people work.
Milwaukee (largest city north of Chicago) is considering a similar ban, as is the city I live in. Also, the state is considering a state-wide smoking ban, which would be nice, but it isn't as strong as the Appleton one, and wipes out local bans.