So you associate cleanliness with uptightness? I guess there could be a case to be made for that in some peoples' minds.
I do feel your pain about the whole issue-I know it's a very difficult habit to break and that it's an associative habit so that you're stimulated to engage along with certain other activities such as drinking.
Maybe they could designate some pubs smoking pubs and some pubs non-smoking pubs. And then people could choose where to spend their pub time. The only thing that wouldn't work there is if a smoker and a non-smoker went out- who would make the sacrifice and submit to the other's chosen environment?
I do know that nicotine is a stimulant. But I have to say that I haven't noticed that smoking has ever been a differentiating factor in who I've found interesting and who I haven't. I doubt that nicotine could stimulate someone enough to change their entire personality or make them better conversationalists.
Do you attribute your sparkling wit to nicotine?

I understand your mood would suffer without it-but do you really think you'd be any less interesting?