The bong is a device used for smoking cannabis, tobacco but also other herbs and substances.
The construction of the bong is very similar to that of the water pipe (by some known as Hookah). The bong and water pipe cool down the smoke before it is inhaled making it easier to inhale. When filled with water it filters out some of the residue in the smoke, making the smoke cleaner to inhale. The biggest different between a bong and Hookah is the thickness of the tube, which is wider with bongs. This makes it easier to take bigger amounts of smoke in one hit.