05:32Boston Calling24/10/2015 04:32 GMT: The Drug Store EditionBBC World Service Duration: 27 minutes Sat 24th Oct 2015, 05:32 on BBC World Service South AsiaAvailable for over a yearListen nowHow the opium trade fuels militant extremism in Afghanistan Show more GenresFactualFormatsDiscussion & TalkBrandBoston Calling Source: BBC Online