Rolling Stone: What was your headspace at the time of Superunknown? A lot of the lyrics are dark. - Chris Cornell

I had a bad PCP [angel dust] experience when I was 14 and I got panic disorder. And of course, I wasn’t telling anyone the truth. It’s not like you go to your dad or your doctor and say, “Yeah, I smoked PCP and I’m having a bad time.” So I became more or less agoraphobic because I’d have flashbacks. From 14 to 16, I didn’t have any friends. I stayed home most of the time. Up till then life was pretty great. The world was big and I felt I could do anything I wanted. Suddenly, I felt like I couldn’t do anything. But in the isolation, my imagination really had time to run. I never did any drugs until my late 20s. Unfortunately, being a child of two alcoholics, I started drinking a lot, and that’s what eventually got me back into drugs. You often hear that pot leads to harder drugs. But I think alcohol is what leads you to everything, because it takes away the fear. The worst drug experimentation I ever did was because I was drunk and didn’t care.

I couldn't do it. I'd go there, and it just made me sick to think about sitting down and applying myself to the shit they were trying to teach me. Not that it's not useful. In a lot of ways, I regret it now, especially in terms of being a writer. I wish I had more skills and knowledge of the language. I have a fairly good vocabulary for how far I went in school, but I always wish it could be better. In a lot of ways, it screwed me up, but I just did not have the attention span for school. My mind would wander, and it would refuse to focus on something that, to me, was devoid of anything exciting or inspiring. A lot of kids really were excited by what they were learning, but I seemed to be a lot better at staring out the window and dreaming.

If you knew someone who was terminally ill and in grave pain, would you participate in an assisted suicide? I would.