On sex: "When you're having more one-night stands in a week than there are nights in a week, something is out of whack in the universe."
On success: "It was so fast. Whatever converged to carve my trajectory through this town, it was ridiculous. It couldn't be sustained."
On drugs: "I'm a garden-variety drug addict. I'd take anything until it's all gone. Forget Hollywood parties. At the end it was me on my own in a room with a kit of stuff every night. It was shite and I was just killing myself."
On sobriety: "Every now and then I miss a night of reckless abandon, but not too often. Like I say, you're always missing something."
On failure: "There was nothing small about Alexander as an endeavour, or as a critical and economic catastrophe."
Read the full interview on page 166 of the October issue, out now
Photographs by Martin Schoeller