I'm sure you're more than right. My friend's husband doesn't smoke at home at all anymore but because guys at work smoke, he still ends up smoking there. The number of smokers in our group of friends has dwindled and I wonder if that's because so many people have stopped smoking. Who wants to leave the party to stand outside by him/herself?!

One other thing I think seems to help is banning all indoor smoking. Lazy people don't always want to make their way outside, especially in cold climates such as the one I live in.