i'd just say that Requiem is probably the deepest movie on addiction I have ever watched...its about addiction on every level and in every facet of life...it really changed me more than any other drug movie...so based on that, its my favorite serious drug movie to feel sad about...trainspotting also is up there like that
scarface is just my favorite serious/action drug movie while requiem, is purely dramatic
btw I love Jennifer Connelly...