Secondhand smoke: hard evidence

Is there any real research to indicate that secondhand smoke is bad? Now there is: Helena Montana had a dramatic drop in heart attacks after banning smoking in bars. Then they dropped the ban, and the heart rate rose again.

The People’s Republik bar, in Cambridge MA, has a chalkboard out front. On the day the Cambridge smoking ban took effect, it read “You can’t smoke in here, but some of us can still stink up the bar.”