Size characteristics of cigarette smoke.

The aerodynamic size distribution of cigarette smoke was measured using an aerosol centrifuge and a cascade impactor. The observed size distribution was log normal with an initial mass median aerodynamic diameter which decreased from 0.52 to 0.38 mu m as the dilution was increased from 10:1 to 700:1. The average geometric standard deviation was 1.38. The differences between these results and those reported by other investigators are attributed to differences in measurement methods.