Basically to rehash stuff thats already been said.....
I do not see an issue at all with a doctor, occasionally taking the odd drug on odd weekends, provided he isn't arriving at work still under the influence, or coming down, or suffering any side effects from said drug (or activities from using the drug), if these side effects impact on decisions he/she makes when seeing patients. I DO have issues with a doctor getting completely trashed all weekend, be it drugs or alcohol or whatever, then seeing/treating patients whilst suffering the hangover/comedown/scatters/or whatever it is they get from their drug of choice.
Having said that, I don't limit such personal judgements to doctors alone. I would also stretch this to all in the medical profession, and to teachers, people that drive for a living, or heck even those that drive to get to work! As well as all the other professions that have already been listed by others. And I include myself and my mates in there, since I and them are included in there based on our jobs. Anyone who has a duty of care, or some level of responsibilty that can affect the lives of others. Do I care if my bartender is fucked on drugs? No, the worst he can do is make me a bad tasting cocktail.
I read this thread with great interest, because, although not in the medical profession, I once had a very close friend completely attack me publicly when I took my first drug in over two years, basically telling me I needed to be reported and arrested and deserved to go to hell because of my job and one pill one weekend. Yet said friend had no issues with me going out and getting shitfaced on alcohol two nights a weekend, every weekend. I *have* been a very occasional drug user because based on my job, and what I know I am like, I decided the two would never mix on a regular basis. Thus ALWAYS, if there was drug use planned, I had the first two or three days of the workng week already pre-organised to have off work. Heck a week if I could wrangle it! And recently I realised the use of drugs amongst my mates and I was beyond what I was feeling comfortable with in relation to myself personally, and my job, and thus have made the decision to abstain for a good few months.
I would be interested to hear if the original poster is against just doctor's using recreational drugs, or also against those in other professions using? Sorry if its already been said, the thread was so long when I got to it, and I may have missed that.