No, don't smoke.
I once told a friend who then contracted Lung Cancer, that it was his fault and he knew the risks and he wouldn't get any sympathy from me.
He hasn't spoken to me since. Can't think why
It might sound harsh, but he's an intelligent bloke with a family, who might not last long enough to enjoy them, which is sad.
If people wish to do it, and not make me inhale their smoke, fine, but don't expect any sympathy when things go wrong