It's a rhetorical question really, isn't it? Do smokers really expect the answer to ever be "yes"?
Yes, I do mind if my friends smoke in my garden then want to cuddle my baby.
Yes, I do mind if they smoke when we're in the park with our kids metres away.
Yes, I do mind if we're having a nice drink outside and I have to sit in a cloud of their smoke.
I know it's their choice and it's legal etc etc. But when it's unpleasant for the person with them, would it be reasonable for that person to say yes, they do mind? It would create a very awkward atmosphere imo.
Farting is legal as far as I'm aware, but imagine if I said to a friend "you don't mind if I sit here farting, do you?"
I don't really see the difference. Both smelly, antisocial habits.
(ps I know I sound sanctimonious. I'm an ex-smoker so it's the law )