As long as he's sober while he's doing it. Also you can look up their records to see if they are good or not i mean it takes a while to get to be a surgeon idk how someone could be bad at it and get board certifide but i guess it does happen from time to time. I don't think weed would change my mind at all.
wouldnt matter to me. smoke all you want// drink all you want. when its job time just handle yourself. thats a career for a reason.