in the united states the high supply of cannabis is due to extensive illegal production within the country largescale smuggling from mexico and largescale production and diversion from states within the united states that allow cannabis production for nonmedical purposes and for medical cannabis programmes authorities of some states have complained of a spillover effect created in their territory by the diversion for trafficking purposes of cannabis from neighbouring states that have legalized the drug for nonmedical purposes united states authorities have also reported a per cent increase in the number of cannabisrelated emergency department visits between and