As for your later post, I agree with the professor in as far as I never worried about keeling over due to the odd visit to a smoky pub either. I'd have a slightly different attitude - and I suspect the prof would too - if I was bar staff. And, unsurprisingly, you don't seem particularly concerned by even the possibility of it causing harm. It just doesn't seem to register in your attitude to your fellow man. And that's not to mention the other anti-social aspects of smoking, as I mentioned above.