Abstract: A smoking device is disclosed whereby smoke and other gases of combustion can be diluted with air to a pre-selected mixture before being inhaled by a smoker. This is achieved by the use of a carbureting tube which can introduce a metered amount of air into a smoke chamber and thereby dilute the smoke to any desired concentration. The smoke is drawn into the smoke dilution chamber by a piston moving towards the outlet end of the chamber, and then pumped out of the smoke dilution chamber by reversing the motion of the piston. A water chamber may also be included to permit the smoke and other gases to be cooled prior to entering the smoke dilution chamber.