Fig. 1.

A schematic of the device used to expose the animals to cigarette smoke is shown. The numbers on the schematic refer to the peristaltic pump (1), pipe (2), cigarette (3), spherical container for smoke distribution (4), and cylindrical tubes (5) where the animals were placed for tobacco exposure. The peristaltic pump aspirates the cigarette smoke, drives it to the distribution chamber, and the smoke then is distributed to the individual chambers.