Let's not ignore the elephant in the room!! We have beautiful Pipes made for smoking cannabis, sometimes called pieces or bowls, are made of a variety of materials, including blown glass, metal fittings (except aluminum), ceramic, borosilicate, stone, wood, bamboo and other materials. Pipes vary greatly in shape and materials, and most are hand made. The common thread between them is that all of the pipes have a receptacle of some sort, a "stem" (which may be a long flexible tube as on hookahs and vaporizers) between the receptacle and a "mouthpiece". The smoking material is placed in the receptacle and affected with a heat source while air is drawn through the bowl and stem to the user.