When I was staying in a dorm, there was a resident adviser on our floor who would check in on all rooms nightly. Not to mention the random people my roommate brought to our room, maintenance personnel, etc. Like everyone else has told you, there's a good chance that someone is going to discover what you're doing...and when they do, you can kiss your education (and probably your freedom) goodbye.

If you're interested in growing, you might want to think about outdoor grows until you're living in a more secure setting. At least that way, if someone stumbles across it, you're a little less likely to be incriminated/incarcerated/expelled.