High hopes for medical cannabis are going up in smoke.

A bombshell new report found “insufficient evidence” to back up most of its supposed benefits — and raised serious red flags about hidden risks.

“Patients deserve honest conversations about what the science does and doesn’t tell us about medical cannabis,” Dr. Michael Hsu , an addiction psychiatrist at UCLA and lead author of the study, said in a statement .

The findings come as Americans increasingly rely on marijuana to cope with chronic pain , sleep difficulties, anxiety and a wide range of other health concerns.

Medical cannabis is now legal in 40 states and DC, and nearly 9 in 10 US adults say they support using it when prescribed by a doctor.

“While many people turn to cannabis seeking relief, our review highligh

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