Alfred W. McCoy, professor of history at University of Wisconsin-Madison has documented the CIA´s involvement in the international drug trade (The Politics of Heroin: CIA Complicity in the Global Drug Trade (ISBN 1-55652-483-8))
Since the U.S. continues it´s presence in Afghanistan with such success at increasing the production of opium, even helping locals to "value-add" by producing heroin inside Afghanistan, it seems quite futile to ask, but please stop selling these drugs.
All that dirty money for sure is useful for your dirty torture programs but it´s not good for Afghanis, Europeans or Americans, please stop.