I'm just as much of a pothead as anyone - nearly every night (actually, sometimes more) and I can completely agree with the OP. Pot (for some) can help you play better. Pot does not make you a better player - so obviously don't start doing pot just to get better at the game. But for most people who already smoke it they understand. Pot really chills you out and helps you focus a LOT. When I'm high, I'm able to better concentrate and in the end it helps my game a lot.
I think video games (Smash more specifically) are the only thing that pot makes me play better at. Games like Mario Galaxy, however, do not go well with pot. I get so confused...lol.
But yeah, I can totally understand where your friend is coming from. And for those who says he's faking it - how old are you, 12?
-Age