Are you healthy? I am completely healthy, which comes as a surprise considering my lifestyle over the years.

Do you worry about your weight? Yes, terribly. I do that trick of only eating half of what is on my plate, and I don't drink any more so it's got a lot better. I gave up about three years ago. I really felt it was wise to look after my hepatitis C because it doesn't go well with alcohol. And it has been very effective. I've only got traces of the disease now.

Attitude to smoking? I really am fed up with it. I'm not even enjoying it any more. My doctor has made an appointment for me to see a hypnotist, and I know when I go, I will stop smoking.

Attitude to drugs? I don't do drugs at all any more and as a result I'm much more focused on my work. I think you can do things creatively in spite of drugs, but it's much better without. I've overcome being an addict and an alcoholic over the years. Drugs damaged me a lot. I think I was retarded by the time I gave up.

Are you happy? Yes. I like an easy life. I like having plans and exciting things to do. I'm going on tour soon and I'm very excited about that. I think I'm in a phase of particular happiness in my life.

Is sex important to you? It is quite. I don't really have much sex and though I'm feeling very well without, it would be nice.

Have you ever had therapy? Yes. I needed it. I started work and left my mother so young. I had a problem with love and affection and safety. I had to really learn to find that in myself, to look after myself.

How do you feel about cosmetic surgery? I'm thinking about it. I'd love to have the area around my neck and my chin just lifted a bit, but the problem is I don't like pain. I think I probably will do it eventually.

NHS or private? Private. I know they are very good on the NHS, and they were wonderful with my mother, but I would prefer not to. I think private is safer.

• Marianne's new album Easy Come Easy Go is out now. She plays the Royal Festival Hall, London on 20 July