mg the smoker uses the tongue 43 to shift into the position at the end of the slot 44 thus moving the firebox to define a combustion chamber under the lower suction tube 34 the smoker then presses the button 28 pauses for a short period to preheat the charge and then sucks on the mouthpiece 37 the heating coil 46 heats the charge in the combustion chamber as an air current moves past and through it and past the wire mesh screen caused by the smoker 39 s inhalation through the screen 38 and suction tubes 34 36 as the temperature of the tobacco leaves rise water and other volatile organic compounds including nicotine vaporize this is the beginning of smoke eventually combustion will occur but only if the smoker desires heating can be controlled by the smoker manipulating the button 28 and it should be noted here that since tobacco leaves only burn at the end of the process the nicotine is already driven off by the time combustion occurs thus efficient and effective delivery of the nicotine is effected to the lungs in ordinary cigarettes a substantial amount of nicotine just serves as fuel and burns partially creating noxious tars in the vaporizer subject of the present invention most of the nicotine reaches the lungs pure and in an unburned state when the smoker has finished the puff he turns the vaporizer and taps the side nearest the suction tube this empties the spent tobacco or ash into the ash pan cavity.