The rocker admits he's opened up about his heavy drinking and drug abuse past, which led to acute alcohol-induced pancreatitis in the mid 1990s, to daughters Grace, 17, and Mae, 14, but he finds it hard to tell them to "just say no" to drugs.

He tells Fox, "There's the conversations we don't need to have, because they know... I don't have to say, 'I know what I'm talking about'. They know what I'm talking about. I've talked to them about my genes that they might have, but I don't live in a fairytale.

"Just me saying, 'Just say no', that's not gonna happen; that's like unicorns with horns. So, I mean, I'm honest: 'You might try some drugs. And you might actually like something. Here's the deal, though, I was your age, and that's when I was doing that. And I chased that first good high for 13 years until my pancreas blew up. So you might have that same thing, and it's not cool. So just watch it'."

Meanwhile, promoting his new book How to Be a Man (and Other Illusions), the bassist tells his past drug troubles have left him with a series of health problems, adding, "Because of past drug use I have a lower tolerance for germs that are on planes and that kind of stuff... I got pneumonia. I got back home, and I let my 14-year-old daughter sort of take care of me for the first time in my life."