A U.N. report says Afghanistan, the world's biggest producer of opium, is also a major producer of cannabis" and "the world's biggest producer of hashish." The U.N. Office on Drugs and Crime issued its Afghanistan Cannabis Survey on [March 31], documenting large-scale cannabis cultivation in half of Afghanistan's 34 provinces. "While other countries have even larger cannabis cultivation, the astonishing yield of the Afghan cannabis crop -- 145 kilograms per hectare of hashish, the resin produced from cannabis, as compared to around 40 kilograms per hectare in Morocco -- makes Afghanistan the world's biggest producer of hashish, estimated at between 1,500 and 3,500 tons a year," said Antonio Maria Costa, UNODC's executive director. The report says money "is one of the main reasons" for large-scale cannabis cultivation. "The gross income per hectare of cannabis (US $3,900) is higher than from opium (US$ 3,600)."