A Capillary Press, a Smoking Machine for the Collection of Native Smoke Condensate. 3rd Report: An Automatic Smoking Machine Equipped with a Supplementary Appliance for Free and Restricted Smoking / Die Kapillarpresse, eine Rauchmaschine zur Gewinnung von nativem Rauchkondensat. 3. Mitteilung: Die automatische Kapillarpresse mit einem Rauchkopf für offenes oder geschlossenes Abrauchen

A supplementary appliance for free and restricted smoking has been developed for the ''capillary press'' smoking machine. The principle of the instrument is also applicable to the automatic smoking machine for rapid series analyses (BAT). The device permitted to examine to what extent smoke yields obtained by free and restricted smoking vary as a function of initial moisture content, puff order, butt length, and the pressure drop of the filter. The yields produced by "capillary press" free smoking of cigarettes whose initial moisture content was 12 % were found to exceed the corresponding yields obtained by restrictive smoking of the same cigarettes by the following proportions; phenols: up to 38 %, nicotine: up to 32 %, mainstream smoke condensate: up to 17 %, and benzo[a]pyrene: up to 13 %. The differences in smoke yields decreased continuously with augmenting initial moisture content (5 to 20 %). Extreme increase of pressure drop (for example by means of filters) resulted in almost complete compensation of the effect of free smoking. Increased retention efficiency of the filter (measured by the indirect method) was simulated.