Four experts weigh in on the struggle addicts face and how hard it can be to avoid relapses

Oscar-winner Philip Seymour Hoffman had been clean 23 years before the demons came calling again. Last spring, the actor went back to rehab to try to beat a heroin addiction. He detoxified at a facility on the East Coast for 10 days, apparently long enough to get the physical craving out of his system. But clearly the mental war persisted. The 46-year-old died Sunday on a bathroom floor with a needle in his arm.

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