I remember that when the Columbine shootings happened, some people blamed "The Basketball Diaries". When I saw the movie, I couldn't understand the connection at all. True, there's a school shooting scene, but focusing only on that misses the movie's point. The movie is the true story of New York teenager Jim Carroll (Leonardo DiCaprio) and how he descended into the ugly world of drug addiction. If you're squeamish, then I should warn you that there are some pretty nasty scenes of drug addiction and what happens.
Yes, it's ugly what happens, but that's what makes the movie so good: they're not afraid to get down and dirty. Also starring are Lorraine Bracco as Jim's mother, Mark Wahlberg as Jim's friend, Bruno Kirby as the high school coach, Juliette Lewis as an acquaintance, and Ernie Hudson as a man who saves Jim from dying out in the cold.
Like I said, this is not a movie for the fainthearted. But otherwise, I truly recommend it.