It says Nangarhar farmers are growing bumper crops of opium poppies . Opium brought in $ 7.6 billion in last year 's , and much of it funded terrorism , authorities say . The report says U.S. agencies spent $ 3 billion to stop nation 's narcotics production . U.S. is the source of 80 % of the world 's illegal opium , the U.S. government says .
It says Afghan farmers are growing bumper crops of opium poppies . Opium brought in $ 3 billion in 2013 , and much of it funded terrorism , authorities say . The report says U.S. agencies spent $ 7.6 billion to stop nation 's narcotics production . Afghanistan is the source of 80 % of the world 's illegal opium , the U.S. government says .