How would your opinion change mate?
And I'm the same - I would atleast try and talk her out of it - but I wouldn't take the cig out of her mouth whilst she was smoking it.
Well, assuming it was someone that I had been close to for a long time, I think I'd be disappointed more than anything else, given that said person should know by now that I despise smoking, and everything that goes with it.
I guess I'd also think of them as not being quite as intelligent as I originally thought, seeing that a) they are past the whole "high-school peer pressure" part of life, and b) have no real reason to begin smoking.
I'm not sure quite how I'd breach the subject with them though.