Coagulation of Mainstream Cigarette Smoke in the Mouth During Puffing and Inhalation

Figures & data

FIG. 1 Schematic diagram of smoke aging apparatus showing flow paths during puffing and exhaust. (Note: HEPA, high-efficiency particulate air.)

FIG. 2 Measured diameter of average mass versus time and best-fit coagulation simulation curves for a medium ventilation cigarette smoked at 35-mL puff volume, 2-s duration, and 30-s puff interval (solid symbols) and a high ventilation cigarette (open symbols) smoked at 60-mL puff volume, 2-s duration, and 30-s puff interval.

TABLE 1 Best-fit initial total number concentrations with corresponding mass concentrations. Initial total number concentrations were those that resulted in the best overall fit of the numerical simulation model to the time-dependent experimental data using the measured initial average size and breath of distribution. Representative examples are shown in Figure 2

	Best-fit initial
	total number	Mass
	concentration	concentration
Ventilation level	(cm^−3)	(μg/cm^3)
Medium (60-mL puff)	1.54 × 10^9	8.3
High (60-mL puff)	8.15 × 10^8	4.7
Low (60-mL puff)	1.56 × 10^9	8.3
Medium (35-mL puff)	7.83 × 10^8	6.7

FIG. 3 Simulation predictions of diameter of average mass versus time for nonfeed aging versus fresh smoke feed aging for two mass concentrations with the same initial diameter of average mass.

FIG. 4 Smoke particle size distribution for fresh, end of 2-s puff, and end of 1-s mouth hold after puff for the data and simulation results of the medium ventilation cigarette smoked at a 60-mL puff volume.

FIG. 5 Simulation results for the effect of mouth hold and posthold flushing time on average size.

FIG. 6 Simulation results for the effect of mouth hold and posthold flushing time on number concentration.

FIG. 7 Simulation results for diameter of average mass versus smoke mass concentration for the end of 2-s puff time point and end of 1-s mouth hold time after puff.