More and more states have legalized marijuana in some form in recent years. The federal government also appears poised to reschedule marijuana following a December executive order from President Trump.
Meanwhile, health care providers across the country have reported spikes in cases of a painful, sometimes debilitating condition linked to chronic, long-term marijuana use: cannabinoid (or cannabis) hyperemesis syndrome, or CHS.
A 2025 study found that 4.4 out of 100,000 emergency department visits were diagnosed as CHS in 2016. In 2020, the rate jumped to 33.1 per 100,000 visits before dropping in 2022 to 22.3 per 100,000.
