I have already seen Requiem For A Dream , one of the movies that hit u hard, surely a depressing one but a must watch. Addiction of any kinda hurts eventually.My few other recomendations for you........plz do watch them if you havent seen them already....
The Basketball Diaries
Requiem for a Dream
The theme of both the movies is same....... but very different treatment and powerfull performances......strong and dark movies I must say. Hits you just like Dancer in the dark....
The Basketball Diaries is already in my wish list