Amy Winehouse's father has said that the troubled singer will die if she does not stop taking drugs.
In an interview with the Sunday Mirror newspaper, Mitch Winehouse said his 24-year-old daughter had developed the incurable lung condition emphysema.
He told the newspaper: "The doctors have told her if she goes back to smoking drugs it won't just ruin her voice, it will kill her. The doctors have said that if she had continued the way she was going she could have ended up an invalid - she wouldn't have been able to breathe.
"She's got emphysema. It's in its early stages, but had it gone on for another month they painted a very vivid picture of her sitting there like an old person with a mask on her face struggling to breathe."
Winehouse added: "With smoking the crack cocaine and the cigarettes, her lungs are all gunked up. There are nodules around the chest and dark marks. She's got 70% lung capacity."
The singer was hospitalised last week after fainting at home and Winehouse said his daughter had vowed to kick her drug habit and had begun a rehabilitation programme.
He said: "If she doesn't go back to drugs, then she can lead this magnificent life. We are praying that that's what Amy really wants. She seems resolute."
Winehouse called on drug dealers to help his daughter's recovery by refusing to supply her with crack cocaine and said he didn't want her "hanging out with her mates like Pete Doherty either".
He said the star could still perform at this weekend's Glastonbury festival because work has helped keep her away from drugs in the past.
"If she hadn't done recent shows in Moscow and Portugal she could have been dead by now," he said. "She abstains and regulates her drug use when she has to do a show."
