Research shows that it is actually several times more dangerous than smoking cigarettes.
It is presumed that the water absorbs the toxins from the smoke rendering it safe for the smoker. On the contrary, the smoke that emerges from the water bowl has several toxicants known to cause lung cancer, heart diseases and other diseases.
In fact, a shisha smoking session may expose the smoker to more smoke than over a longer period of time than cigarette thus increasing the hazards by many folds. Cigarettes smokers typically smoke a cigarette for five to seven minutes taking eight to twelve puffs of 40 - 75 ml each.
In total contrast, shisha smoking session lasts 30-80 minutes or even longer and a smoker inhales almost a litre of smoke which is equivalent to 100 or more cigarettes in one session.
This smoke contains high levels of toxic compounds, including tar, carbon monoxide, heavy metals and cancer-causing chemicals (carcinogens). It contains the same amount of nicotine as cigarette smoking, possibly leading to tobacco dependence.