- Emergency department visits involving cannabis use are increasing among out-of-state visitors
- Adverse side effects of cannabis include anxiety, hallucinations, palpitations and vomiting
- Other states with legal marijuana could face similar problems
CHICAGO --- Out-of-towners using marijuana in Colorado -- which has legally allowed sales of the drug in retail dispensaries since 2014 -- are ending up in the emergency room at an increasing rate, reports a new study from Northwestern Medicine and the University of Colorado School of Medicine.