A rare illness that causes vomiting and abdominal pain has increased in the past year. It is usually heavy pot smokers that get the uncommon disease.

Experts do not know as to why this occurrence is happening. They cannot explain the disease that is connected to smoking marijuana, Web MD reported. The rare illness is called cannabinoid hyperemesis syndrome or CHS. It is also known as cyclical vomiting syndrome. This disease is very rare but is on the rise as of late.

States that legalized the use of marijuana in the U.S. are suffering from the increases of patients that have cyclical vomiting syndrome. It is evidently more than the states that banned the said plant. It is because of the marijuana sold in the black market is less strong that what is commercially being sold. According to Forbes, in Colorado the number of people with cyclical vomiting syndrome has double.

Colorado has legalized medical marijuana use in 2009 and recreational use of it in 2012. Since 2009, many patients have been going to Colorado hospitals and them all showed symptoms of cyclical vomiting syndrome. "When the decriminalization of medical marijuana occurred and the number of medical (marijuana) licenses in the state went up dramatically, we started seeing more and more cases of young, otherwise healthy people who would have multiple recurrent episodes of severe abdominal pain and vomiting and often end up in the emergency room," said Kennon Heard, MD, chief of medical toxicology for the University of Colorado Anschutz Medical Campus in Aurora.

This disease was not as prevalent as it is now because not many people admit that they are pot smokers because it was illegal. After marijuana has been legalized, the cases have double. Doctors are now finding more symptoms and cases to research on about this disease. They need to know first as to why it does that to pot smokers' bodies.