Correct me if I'm wrong but this post reads like the answers are an easy 'no' but doesn't address GPs situation.
I don't see how this is relevant to the question, unless you want to get into whether their burden on the medical system outweighs their right to do what they want with their bodies (but lung cancer/emphezema, diabetes/heart disease, and traumatic injuries from extreme sports would fall into that category as well).
> Smoking and junk food don’t have the huge impacts to how you treat those around you that being drunk all the time does.
We don't lock up sober assholes for being assholes either.
The question is: where does someone's right to do what their brain makes them want to do end? Individual autonomy is a big deal in a free society, as it should be. When you take away a person's freedom to act, I think you take away part of what makes them human.
Probably we all do this at some level. Hopefully we can encourage each other to do the right thing, but most of us won't at least some of the time. And, sometimes the other party really doesn't know best or understand all the circumstances.