Robert Downey Jr. says his drug addiction started early, alleging in an upcoming issue of Rolling Stone that his father, Robert Downey Sr., began giving him drugs when he was 8 years old. Downey Jr. also recounts doing cocaine with his dad and Jack Nicholson, and talks about how he got involved with heroin. "All those years of snorting coke, and then I accidentally get involved in heroin after smoking crack for the first time. It finally tied my shoelaces together," he said. Downey has been sober for seven years, and says he plans to stay that way.