Study finds oil makes up half of Afghanistan 's gross domestic product . Agency encourages NATO forces to attack the problem aggressively . `` We share the U.N. 's concerns , '' Appathurai told CNN . `` Drugs not only poison people , but they poison economies and governments , and it is in everyone 's interest to stop this proliferation . '' Drugs funds insurgency ; heroin grows unchecked in Taliban camps . U.N. drug policy advocates providing income alternative for poppy farmers .
Study finds oil makes up half of Afghanistan 's gross domestic product . Agency encourages NATO forces to attack the problem aggressively . Drugs funds insurgency ; heroin grows unchecked in Taliban camps . U.N. drug policy advocates providing income alternative for poppy farmers .