My nephew became seriously ill last year when he went from an occasional joint to daily marijuana usage after pot became legal in California. Constant vomiting, headaches, back pain, disabling stomach cramps, etc.
He thought it was stress related since he was in the middle of moving his family from Indio to rural property in central California. But when he sought medical attention after suffering for several weeks, he was told the tipoff that marijuana was the cause was the only thing that would relieve his abdominal pain was a long, hot bath or shower.
At his doctor's urging, he stopped using pot and it all went away.
It's called
cannabinoid hyperemesis syndrome and is only now gaining attention with the legalization and increased use of marijuana.