Long term cannabis use (typically > 2 years)
Severe cyclical nausea, vomiting 
Weekly use of marijuana
Relief of symptoms with hot showers or baths
Abdominal pain: epigastric or periumbilical
Resolution of symptoms with cannabis cessation
Age < 50y
Weight loss > 5kg
Symptoms greater in morning
Normal bowel habits
Negative labs, imaging and endoscopy
Cannabinoid hyperemesis syndrome
ACS/MI
Serotonin syndrome
Boerhaave's
Caffeine withdrawal
DKA
Nicotine toxicity
Intracranial Hemorrhage