Amy Winehouse [ tickets ] has been diagnosed with emphysema and could--within one month--land in a wheelchair with a permanent oxygen mask if she doesn't stop smoking crack cocaine and cigarettes, the Sunday Mirror reported. Doctors told the 24-year-old performer if she goes back to smoking drugs, it won't just ruin her voice, it will kill her, her father told the Mirror.

Winehouse reportedly underwent an extensive series of tests when she was hospitalized last week after fainting at her London-area home. In addition to the emphysema, the tests revealed a lump in her chest. However, a scan reportedly has shown it is not cancerous and there are no traces of cancer in her blood.

Winehouse also was diagnosed with an irregular heartbeat, however it now has been regulated with medication.

Mitch Winehouse said he hopes his daughter will be able to perform at the upcoming Glastonbury Festival because he believes she abstains and regulates her drug use when she has to do a show. Doctors reportedly said Winehouse is physically able to perform as long as she stays off drugs.