An early Al Pacino, from 1971. Bleak, fairly soulless, a not-at-all Trainspotting take on a completely insular heroin scene in New York. The movie provides no reason for people to do drugs; simply they are addicts and have no moral fibre. It is a product of its time, I guess. Pacino is OK playing a low-grade shell of a hustler. His next role was Michael Corleone.