Hookah (Persian. قلیان - ghalyân, ghalyun) - device for smoking, allowing to filter and cool the inhaled smoke. The role played by the filter hookah shaft on the cold walls which condenses various impurities, and the jar of liquid in which to settle 38% of the contained substances in the smoke. The vessel was inserted into a smoking cup (water chestnuts), joined to the tube (mine), the end of which goes under the water. Above the water level of the vessel departs another tube through which produced smoke inhalation. When smoking a hookah in the vessel creates a vacuum, so the smoke rises through the liquid and through the tube with the shank enters the lungs of the smoker.