I've known a few programmers who can, but I most definitely can not. I started out as a [web and print] designer in my late teens and was stoned all the time.

I've known a few programmers who can, but I most definitely can not. I started out as a [web and print] designer in my late teens and was stoned all the time. It seemed like a dream to me - stoned and productive. As I moved into programming in my early twenties, I found myself completely unproductive when high. Very much akin to reading a book while very stoned, where I'd find myself reading the same page for a while, and then while trying to focus, read the same sentence 20 times and realize I haven't comprehended a thing. My attention span wanders far too much. And now, about 15 years into my profession as a programmer, any more than the smallest toke will make me completely incapable of coding effectively (though I can generally think programming problems through just fine). As a comparison, I've programmed drunk plenty of times. These days, after a couple whiskeys, I'm fairly useless - although I think that's more a case of "I'd rather relax than work" over being incapacitated.