This week I happened to have a late breakfast at a local diner. It was well-past the morning rush so it wasn't crowded. But the distribution of the crowd was still interesting.
Half the restaurant is reserved for smokers, half for non-smokers. On the smokers' side, one booth was occupied but nobody was smoking. On the non-smokers' side, six boothes were occupied.
On Sunday, the restaurant is all non-smoking.
Maybe this place is unique in Michigan, but I doubt it. Instead, I suspect it's a good illustration of why a smoking ban would help restaurants, not hurt them.