A bong, also commonly known as a water pipe, is a
smoking device, generally used to smoke
marijuana and
tobacco, but also other substances. The construction of a bong and its principle of action is similar to that of the
hookah, which is also called "water
pipe". Smoking a bong contrasts with smoking a
pipe or
cigarette in two major ways: bongs cool the smoke before it enters the user’s
lungs (making it easier to smoke), and a large amount of smoke is inhaled quickly as opposed to the smaller, more frequent, inhalations of pipe and cigarette smoking.
See more at Wikipedia.org...