Heh heh.

I forget where I got this from, either a forum thread or something on TV recently, but it seems that the word "Hashish" is just Arabic for 'grass'. Hence the intoxicant reference.

Presumably, the word 'Hashishin' would translate as 'people of the grass' or 'people [hiding] in the grass', in reference to their concealment expertise.

The original snipers, no less!