First, I hate smoking. That said, I also disagree with bans on smoking, lets businesses do as they please.
As far as the dangers of second-hand smoke, all I can say is I grew up in a chain-smoking household and I lived a very sick life up (breathing and hacking up muckus) until I turned 18 and left.
So did many of us. But not very many of us experienced what you did. I guess it just depends on our environment above all else. A lot of different factors involved. Know what I mean?
I have been heating my home with wood. I live with sinus problems. Plus, I live in farm country surrounded by all the junk the farmers lay down on their fields. A lot of different things in the air around us. Very hard to pin point just one devil. :)
I agree with your post--let the businesses decide. I grew up in a smoking household, too. Yecch! My dad used to smoke in the car. The windows were almost always rolled up. To this day, I get sick to my stomach just thinking about it.
The good news is he quit smoking before it was too late.