hookahs are nice, though like everyone else said watch out for the holes to be to big. But my real advice is to get one that has a small enough chamber. My point is this, MJ smoke goes stale rather quickly, so if the chamber is large then the remaining smoke after a hit has been taken usually ends up being wasted. Seeing as there is no carb to clear the chamber with the smoke can just sit around and all the goodness of it will come out.

So in other words find one that has a small enough chamber to not matter too much if it gets wasted, overall, though i would not recommend hookahs for smoking mj alone. Maybe as another use for one that you may already have but not specifically for MJ.