Originally Posted by Coyotero
My own theory is that once you reach a certain length in terms of stem (Say, around 25 inches or so) Any cooling effect is significantly degraded. After traveling so far, the smoke is going to get as cool as it can possibly get, and you hit a point where the additional length will actually begin warming the smoke back to room temp. Just an idea, mind you... I'm not a physicist.
hmmm, that makes a lot of sense actually, but now that makes me wonder if you had a sub 20" hookah if it would come into play or not. hrmmm...