"I’m Brad Pitt and I’m a drug addict," the "Killing Them Softly" star, 48, joked, laughing, at Friday’s "The House We Live In" screening in Los Angeles, where he introduced filmmaker Eugene Jarecki, whose new documentary investigates the drug epidemic in the U.S."No, my drug days have long since past," clarified the engaged father of six. Pitt has been frank about his marijuana use in the past. In a controversial Parade interview from September 2011, Pitt said the earlier phase of his superstardom left him depressed and smoking pot.