Idol recalls his addiction struggles in his book Dancing With Myself. And while Stevens says drink and drugs were in the studio, he admits he didn't know the levels of the singer's excesses while on tour.

Stevens tells Guitar International: "It's amazing, because he kept a lot of that from me. I wasn't privy to it. We would drink and do little bit of drugs in the studio, but that wasn't really the place for it. While on tour everyone would retreat back to their hotel rooms, we were never like, 'I have a brick of heroin, wanna join?'"