Iran has a terrible heroin problem

I think they use a very cheap synthetic form

Basically because of the stigma with alcohol , this cheap synthetic heroin is the drug of choice . Also a lot of the poppy paste from Afghanistan is smuggled into Iran for shipment further out

ISIS soldiers do use a amphetimine pill that makes them more brave and more capable of suicide attacks in battle .

The Germans used amphetimines too and this is partly why Blitzkrieg was so effective in France as the soldiers could stay awake for days and just run over armies and their defenses . The Allies were so concerned about this super drug that they started experimenting with their own cocktail . The furthest I can find research on this is that the Allies preferred some type of Benzo as soldiers performed the best in shooting tests .