(CNN) An unusual illness is on the rise in the United States, especially in states that have legalized marijuana. "Patients often say, 'You know, it's always in the evening when I get this nausea, vomiting,'" Wang said. However, despite the popularity of marijuana as a pain killer, study results on its effectiveness have been mixed. The use of medical marijuana had been legal since 2009. Between 2005 and 2014 when only medical marijuana was legal in most states, a 2020 study found nearly one in five people hospitalized for cyclical vomiting in the US reported concurrent cannabis use.

Source: CNN September 17, 2021 15:00 UTC