Doctors fear Amy Winehouse could be brain damaged after a cannabis overdose.

Popular on LondonNet

The troubled Rehab singer indulged in a 36-hour pot smoking session in July this year, which left her vomiting uncontrollably and hallucinating.

Medics also warned the hellraiser will die if she has another drug binge and worried she would break bones during a fit, which a friend said was “like something from The Exorcist” – the infamous horror movie in which then-child actress Linda Blair projectile vomits pea soup after being possessed by a demon.

The star’s pal has also revealed how the 24-year-old overdosed on a mixture of crystal meth, cocaine, heroin, ecstasy and ketamine in August 2007.

The source told The Sun: “The future is bleak. Mitch does everything he can to protect his daughter – but his ‘explanation’ for Amy’s hospital dash in July was just untrue.

“She had smoked an inhuman amount of hash which resulted in acute cannabis poisoning. You have to take a s**tload of pot to suffer that severe a reaction.”

The award winning singer is said to be so drug ravaged she will not be well for years. Her friend added: “She is in need of years of psychiatry and medical treatment if she has a hope.”