At 20, you're cocky and you think you can rule the world, and you get it all wrong.

I think of stress as the creator of cancer and heart attacks, like a tiny little ball you feed. I believe that one of the reasons I've never got ill is that I'm not stressed.

Anyone who goes on 'The X Factor' to make big money will be in for a big shock.

I was slightly cynical of the American mentality before I came over here, but now I preach it. Here, no one's going to tear you down if you buy yourself a $300,000 car. They're likely to say: "Well, you probably worked hard for it. Good luck to you."

You have an advantage if you win. I always think it's best to be remembered as a winner rather than as the runner-up. It's definitely more fun getting the gold than it is the silver.

Whether they run a record company or a grocery store, every boss will tell you you're in big trouble if you're borrowing more than you can ever afford to pay back. Delaying the pain for future generations is suicidal. We've got to start getting the deficit down right now, not next year.

My heart, my lungs, my blood - they've all been checked. I remember one of the doctors almost being disappointed when he showed me the results because he couldn't wait to tell me what smoking was doing to me. But there was nothing there.