i'm 25 myself, doing the university thing right now...
I'm a continuous relapser because every time i'm sober for a few hours, days, weeks, months (never made years lol) i convince myself that I am 'normal' and I can have just one spliff or beer, or both.
I'd give one hell of a lot just to bann that crap out of my life....why u still want it after five years??? There are thousand other ways to relax!!!!