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The Panic in Needle Park (1971)
http://imdb.com/title/tt0067549/
this is one of Al Pacinos first movies. I just saw this recently and thought that it was decent.
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QFT
Also...
Clean & Sober (Michael Keaton)
New Jack City (Wesley Snipes) For the impact on society
And finally.....Cheech & Chong's Up In Smoke (Hollywood Squares answer)