One of my friends from college use to smoke, he actually quitted just recently, saying that the cigarettes he brought didn't taste too nice. If he brought some good one's, he would still be smoking, and of course, stink. I've also seen a few guys in my class smoke weed, their eye's literally turn red, haha. They couldn't even stare at the computer monitor when we were in class because of how much they took. At some point, one thing that's most funny is when they got bummed out completely from taking alot.
From my experience of watching people take it, not the best thing to take, especially when you're going to be starring at computer screen for 1 hour.