Re: About a hookah.
Hight of the stem is not really important as long as it doesnt heat the water which is rare for anything above 15-20 inches. The difference is in the base. The less water the bsae holds the faster it will get dirty from the nicotine and the smoke will start smelling bad after 20-30 minutes into a session. A large egyptian holds enough water for around 3 sessions while with a medium i personally cant smoke a second bowl unless i change the water. With a small one i start to notice the flavour of nicontine after 40 mins or so into the session which keeps me from enjoying a full bowl.
Concusion = as long as the base is big enough, stem height is alsmost irrelevant.