Afghanistan is currently the primary producer of the drug. http://en.wikipedia.org/wiki/Opium
After regularly producing 70% of the world's opium, Afghanistan decreased production to 74 tons per year under a ban by the Taliban in 2000, a move which cut production by 94 per cent.
A year later, after American and British troops invaded Afghanistan, removed the Taliban and installed the interim government, the land under cultivation leapt back to 285 square miles (740 km2), with Afghanistan supplanting Burma to become the world's largest opium producer once more.
Opium production in that country has increased rapidly since, reaching an all-time high in 2006. According to DEA statistics, Afghanistan's production of oven-dried opium increased to 1,278 tons in 2002, more than doubled by 2003, and nearly doubled again during 2004.
In late 2004, the U.S. government estimated that 206,000 hectares were under poppy cultivation, 4.5% of the country's total cropland, and produced 4,200 metric tons of opium, 76% of the world's supply, yielding 60% of Afghanistan's gross domestic product.
In 2006, the UN Office on Drugs and Crime estimated production to have risen 59% to 407,000 acres (1,650 km2) in cultivation, yielding 6,100 tons of opium, 82% of the world's supply



