The adverse effects of marijuana are well documented, as well as its positive therapeutic uses. Cannabis has traditionally been associated with an antiemetic action following acute ingestion and synthetic cannabinoids have an established use as antiemetics for chemotherapy induced nausea. However, there has been limited recognition of chronic cannabis use as a cause of cyclic vomiting syndrome. Cannabinoid hyperemesis was first identified by Allen er al in 2004. Compulsive bathing was also described as part of the clinical picture. This same syndrome has been confirmed a number of times in the medical literature in the interim. The condition has, to our knowledge, never been reported, in a psychiatric patient.