In an average one-hour hookah session, you inhale 100 to 200 times as much smoke as from a single cigarette.
"Waterpipe Tobacco Smoking: Health Effects, Research Needs and Recommended Actions by Regulators. WHO Study Group on Tobacco Product Regulation (TobReg)." World Health Organization. Geneva, Switzerland. 16 Sept. 2005.
Those glowing amber charcoals used on hookahs? They release high levels of dangerous toxic agents like carbon monoxide, metals and cancer-causing chemicals.
Cobb, Caroline, et al."Waterpipe Tobacco Smoking: An Emerging Health Crisis in the United States." American Journal of Health Behavior. 34(3). May-June 2010: 275–285. Web.