Mysterious bouts of intense vomiting may be caused by frequent marijuana use, health officials warn.

With the illness recently having been recognized by the World Health Organization, University of Washington researchers hope to find the cause behind a mysterious, cannabis-linked disease.

The condition, cannabis hyperemesis syndrome, has become prevalent in recent years with increased chronic use of the drug postlegalization. It can be difficult to diagnose because the recurrent vomiting only develops years or decades after an individual becomes a frequent cannabis user.

“People will vomit four or five times in an hour and go to the emergency room because it’s really painful and uncomfortable,” said University of Washington cannabis researcher Beatriz Carlini. “But until recently, very

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