"Fighting the war on Afghanistan opium seems almost insurmountable, but the United Nations Office on Drugs and Crime, UNODC, works hard at finding ways to solve the problem. In 2000, a ban on the Taliban-led Afghanistan, which produced 75% of the world’s opium, yielded a 98% drop in the poppy production. However, when the Taliban lost control in 2001 the opium trade increased. By 2006, Afghanistan generated 94% of the world’s supply".
Afghanistan opium poppy cultivation 1994-2007
P.S. I've found interesting news: "Russia accuses the United States of conspiring with Afghanistan's drug producers by refusing to eradicate opium plantations in the country. US marines, stationed in the opium-growing Helmand province since February, told the villagers that they do not intend to cut the production, the Russian Foreign Ministry said Sunday".