pot does not make you any less intelligent than you were before smoking. The only thing that smoking pot will do to you as far as your ability to learn goes is that it does harm your short term memory slightly, but even then, that is not a serious, life-long thing. Your entire memory capacity should come back within 1-3 months of stopping smoking. The problem with drugs and grades comes when people start caring too much about the pot/other drug and stop caring about other things. The pot is not what makes grades fall or makes you fail classes or tests, you fail because you would rather just get stoned than study.

~Matt