Troubled singer Amy Winehouse has developed emphysema and has been warned by doctors that she will die if she continues smoking drugs, said her father, Mitch Winehouse, in an interview. "The doctors have told her if she goes back to smoking drugs it won't just ruin her voice, it will kill her," he told the U.K.'s Sunday Mirror. "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. 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 percent lung capacity." Her father remains hopeful for her recovery. "If she doesn't go back to drugs, then she can lead this magnificent life," he said. "We are praying that that's what Amy really wants. She seems resolute."