Just stumbled on this thread seeing what was in this section... Interestingly I know several doctors, nurses, teachers and a pharmacist who are all regular recreational users. No surgeons, tho I don't think I'd mind, I've had surgery twice this year (in fact my last op was last week). I think all sensible people know their limits of 'capability', there's a huge difference between having a wee puff, and pulling off a large bong.
It's like the Govt. here citing psychosis (brought on by high THC in called 'skunk' by the media) as a reason not to downgrade cannabis or contemplate sensible debate about regulation and medical use. When you compare super strength weed to imported Moroccan hash, it's like comparing the strength of vodka v's beer. You wouldn't order up a pint of vodka and then drive... but you might have a beer.
As responsible people I'm sure surgeons wouldn't consider doing something if they thought they were too baked to perform their job, and I know in what I do it actually focuses my mind on the job at hand rather than letting my mind wander about.