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


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

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