In the United States, the high supply of cannabis is due to extensive illegal production within the country, large-scale smuggling from Mexico and large-scale 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 non-medical purposes. United States authorities have also reported a 62 per cent increase in the number of cannabis-related emergency department visits between 2004 and 2011.