i agree with a lot of the above advice, but i want to add one thing -

be careful about keeping your smoking stuff in your dorm room - if you do, never leave anything out, if your door is open and an RA or someone in authority walks by and you have a bong in plain view, you can get busted. also, my school just started sending drug dogs through the halls - this is random, i think it happened 3 or 4 times this past year in each dorm (i didnt live on campus). but i've heard if you keep your stuff in the fridge, they can't smell it. i dunno, i never tried it - it might not work at all.