Onagar, I can't see why you keep bringing car fumes into it, the post is not about a car fume problem, it's about inconsiderate neighbours really.
It is unpleasant to have someone else's smoke drifting into your house on a daily basis, especially when you have a child with chest problems. It also says in the paper (which I have read, thanks for another snidey aside btw) that it is a particular risk for children.
As you keep referring to car fumes, would you be happy to live where your neighbours left their car running under your window for 10 mins at a time several times every day, so the fumes drifted in? There is more than one smoker here, it is not a small amount of smoke, and it is not in the great wide open, and it not just the odd time.
I don't know if you smoke, or if the smell particularly offends you, but the OP dislikes it for many reasons, and it is wrong to tell her that she is overreacting because she just believes what she reads in the papers.
As far as the taxes argument goes, yes that's great, FAQ has posted a link. However, it just doesn't seem sensible to me to say people should keep smoking because otherwise we would lose lots of revenue. I can see a politician saying that privately (!) but from any mouth other than that it seems misguided.
Your argument seems to be that you feel that people here are becoming fixated on a bit of smoke when there are other bigger problems? I think most of us (sweeping statement, sorry those who don't agree) would have a problem with those other things too. I don't think I should dislike cigarette smoke exclusively you know. Of course car fumes are more poisonous, that doesn't mean you should discount the poisons in anything else you inhale does it?
I also try my best not to spend any time in an enclosed room with car fumes