Here is a link for a post on hookah pro.
I also did a google search and got over 3 million hits lol.
anyways here were the top couple sites for hookah vs cigarettes
"[In a hookah] the tobacco is heated rather than burned. The hookah tobacco is generally void of the chemical additives found in cigarettes. In fact, hookah tobacco is usually composed of only tobacco, glycerin, sugar and flavoring. This is a far cry from the nearly 600 additives that can legally be added to cigarettes. These additives also transform into other chemicals when burned - a process that happens every time a cigarette is lit and smoked."
"Today's media sometimes suggests that hookah can be a more health threatening activity than smoking cigarettes. Research suggests that a session of hookah tobacco smoking (tobacco molasses) which lasts 45 minutes delivers slightly more tar and carbon monoxide (around 5-10%) than a packet of cigarettes.This study has, however, come under criticism for using unrealistically high temperatures for the tobacco (600-650 degrees C) and using arbitrary figures for tar filtration rates.This could possibly have skewed results, as the carcinogenic and toxin levels of smoke increases dramatically with temperature. Common practice is to keep temperatures to degrees which do not "char" the hookah; that is within a temperature range of 100-150 C."