Amy Winehouse's friends fear she is "getting back to her worst".
The 24-year-old troubled singer - who left rehab in London earlier this month - has reportedly been begged to return for treatment by those close to her.
A source told Britain's The Sun newspaper: "Amy's in an awful state again - she's clearly on drugs. Many of us think full-time residential rehab is the only option but she won't go back.
"She was smoking cannabis and drinking heavily as soon as she left rehab. That has now increased. Everyone who has seen her in the last week or so has been really disturbed by the state she's in. She's getting back to her worst."
The 'Rehab' star's friends and family reportedly held crisis talks this week after Amy, who has a history of self-harm, was seen with scratches on her left arm.
It is also thought her husband Blake Fielder-Civil, who is currently in London's Pentonville Prison on charges of perverting the course of justice and grievous bodily harm, has threatened to ban her from visiting him because he is convinced she is still taking cocaine.
The pair also reportedly had a massive row over the weekend after Amy turned up an hour late for a prison visit.
A furious Blake reportedly told Amy "not to bother" visiting again.