Legs11--
Exactly. Bin Laden and pals are dead keen to keep the drug trade going because it's their only major source of income, and they see it as a poison that weakens the West and thus part of the jihad. The last thing they'd do would be to kill off all the punters. A rumour that all smack is contaminated with anthrax would probably be the work of western agencies, much as the 'acid has strychnine in' rumour probably was.
Incidentally, the thinking is that the Taliban are releasing vast amounts of stockpiled opium which they've kept back from a few recent bumper crops. There'll be a lot more smuggling going on, so that's something else for people to keep an extra sense of awareness about.
R