It is a matter of rights. The right to breathe air that isn't being filled with carcinogens by a cigarette being smoked right next to you. When someone smokes, that smoke can affect those around them. I think those that don't smoke have a right to NOT be subjected to that.

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Put me on wheels and I'll turn tricks.

Clever? Nah, I ran out of that years ago. But if you find this, let me know, k?
"The road goes ever on..." ~ Tolkien

In memory of my friend skip...
Go then, there are other worlds than these