Evolution of the Gas-Vapour Phase and the Total Particulate Matter of Cigarette Smoke in a Single Puff

The concentration of gas-vapour phase components of cigarette smoke increases almost throughout from the beginning to the end of each puff, as produced on a piston-actioned smoking machine. While this is not true for all substances examined in the 5th puff, it is obvious in the 3rd puff, and very pronounced in the 8th puff, where the increase in volatile components from the second to the last thirds of a single puff is important. This indicates without any doubt that the concentration in volatile components increases from the beginning to the end of a puff. This effect is increased as the smoking progresses towards the butt end of the cigarette. The yield of the crude smoke condensate is about the same in each third of a puff. In the last puff, however, the increase from the 2nd to the last puff third is very pronounced and is comparable to the increase in volatile smoke components from the beginning to the end of the puff.