I am friends with smokers. I will occasionally partake myself, if other friends are doing it and my daughter won't be around to smell me. I don't want her thinking of me as smelly.

(though by that logic, i shouldn't go running with her either.) Plus I figure if she never sees me smoking, she doesn't have to know that I occasionally do and we won't get into a "do as I say, not as I do" situation.
For you, given how much you hate smoking, that particular friendship is probably not going to work out.