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 . Comment: As NATO winds down its war effort in the nation , the trend would appear to bode ill . Afghanistan 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 . Comment: Afghanistan is the source of 80 % of the world 's illegal opium , the U.S. government says .