hookahs are alright for "whatever" you're smoking.  However, there is a fundamental flaw in the hookah that makes them undesirable, particularly with inexperienced smokers.  
Picture, if you will, four (less or more) sucks vales with one intake - blow valve/bowl of burning whatever.  If all four hoses are sucking, all is good.  If one hose is left unattended, there creates a pressure differential where the remaining suckers only get a fraction of the disired intake, watered-down by the non-sucker's empty hose.  Now, to aleviate this problem, the non-sucker can plug his/her hose to rebuild the original pressure differential  to the main inlet (bowl) so all can get thier goods.  What is needed is a check-valve for each hose, a problem that I've overcome and am willing to sell/give plans to the entrepeneauring pothead.
Cliff notes:  
All suck or the hookah sucks
Plug the hole for better suck
I've invented a hole-plugger so that all can suck freely.