When I visited Germany in 2010 on a foreign exchange, I smoked a lot of hookah with my new local friends. Having no prior experience at the time, I took everything these guys said as the correct way to smoke this thing... but when they filled up the hookah with milk instead of water I was really confused. I asked and they said that it produced a more smooth and clean smoke. Have you guys heard of this or know anything about this?
I always just fill mine up with tap water .