Stevie Nicks Opens Up About Past Cocaine Use

"All of us were drug addicts," the Fleetwood Mac singer said.

The rock icon is candid in the magazine's cover story, which hits newsstands today, adding, "but there was a point where I was the worst drug addict."

"I was a girl, I was fragile, and I was doing a lot of coke," she said.

"I was very worried about her,” Petty reveals. “To the point that if the phone did ring and they said, 'Stevie died,' I wouldn't have been surprised.”

Having kicked the hard stuff, Nicks admits she still smokes a bit, especially with her still active in the music industry today.

"When I'm writing, I will allow myself to smoke a little bit of pot," she added. "It's my one little thing that I can do. I use it as a tool, and I'm very careful, you know? And I get results. However, if I thought it was going to lead me back to something worse, I'd stop."