A mysterious syndrome that makes marijuana users violently ill is starting to worry doctors


A new study documents a sharp rise in emergency room visits linked with marijuana following legalization in Colorado. One of the key drivers of the ER visits is a mysterious syndrome characterised by severe nausea and repeated vomiting. Called cannabinoid hyperemesis syndrome , or CHS, very little is known about the condition. The only known cure for CHS is to stop using marijuana. Researchers still aren’t sure what causes it.

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