I haven't really thought about whether I would be a business partner with someone, but in this case quantity certainly matters. When people say smoker, it is implied someone who smokes often and constantly throughout the day - 24/7. The equivalent drinker would be an alcoholic, not just someone who has a beer on Friday.
In a judgment free way - my dad's long-term business partner was overweight. Died super young, in his mid-60s. It was heartbreaking for everyone involved, and I would not wish it upon anyone. Please take good care of yourself.
That's a good question. Interestingly not! For one part I think that drinking (modest) amounts of alcohol is not as bad for your health as smoking. I would avoid people who love binge-drinking though, for the same reasons as above. Also it is much harder to find non-alcoholics than people who don't smoke, I would think.
Being overweight is a different card, because it's a symptom, not an action that is chosen voluntarily. There can be many reasons for being overweight... maybe genes, some kind of illness etc.. I can't judge based on something I don't exactly know. But then again ... when I see someone eating lots of fast-food, chips and drinking Cola ... I would probably hesitate to ask him to become my business partner.
This is all seemingly a very superficial and judgmental process you've described for selecting a business partner. I'd probably want to know more about their work experience and skills - not so much their taste in cola or cigarettes.