Afghanistan is now the world's largest producer and exporter of heroin (not just growing poppies). " Clandestine labs churn out so much product that the average heroin price in
Western Europe tumbled from $251 in 1990 to $75 a gram" (in January 2006) (adjusted for inflation, according to the UN Office on Drugs and Crime.

Source: Wall St Journal 12 JAN 2006

2005--opium exports were 52% of Afghanistan's GDP. (UNODC estimates)