Complete utter bullshit, but hey, somehow you got to keep up the anti islamic / terrorist awareness in the USA too.
Nobody could care less if junkies die and in fact you'd do most of them a favour by killing them.
Afghanistan is a heroin country where over 90% of all heroin world wide comes from, so if he'd want to poison people through drugs he could do it easier with heroin from the country where he resides in.