Did you ever hear of cannabinoid hyperemesis syndrome, or CHS? According to CBS News, it is caused by heavy, long-term use of various forms of marijuana. For unclear reasons, the nausea and vomiting are relieved by hot showers or baths. CHS can lead to dehydration and kidney failure, but usually resolves within days of stopping drug use. CHS has only been recognized for about the past decade, and nobody knows exactly how many people suffer from it. But as more states move towards the legalization of marijuana, emergency room physicians are eager to make sure both doctors and patients have CHS on their radar.