Philip Seymour Hoffman snorts heroin, enters rehab Philip Seymour Hoffman, here in the film The Master with Joaquin Phoenix, has just finished a stint in rehab to deal with heroin addiction. PHILIP Seymour Hoffman has revealed a heroin habit prompted him to check into rehab last month. The Oscar winner spent ten days in a detox facility after falling off the wagon more than a year ago. TMZ reports Hoffman had struggled with substance abuse in the past but kicked the habit for 23 years. His relapse started with prescription pills and escalated to snorting heroin. Hoffman told TMZ the heroin use lasted about a week before he realised he needed help and checked into a detox facility. He credits "a great group of friends and family" for helping him seek treatment to get better. Hoffman checked out on May 24 and is now back on a movie set in Europe. Hoffman won a Best Actor Oscar in 2006 for Capote.