He notes that the Taliban produce 93% of the world’s opium supply:

An unnamed U.N. source said, “It’s hard to tell whether people are inspired to plant poppies after reading the Koran, or whether contact with all that opium draws them naturally to the wisdom of the Koran. Either way, the money goes to fund Islamic jihad.”
However, a Taliban source said that according to the Muslim holy book, “it is permissible to sell illicit drugs to buy illegal weapons to slaughter infidel civilians.”