Variations in Amounts of Tobacco Tar Retrieved from Selected Models of Smoking Behavior Simulated by Smoking Machine.

The observation was made of variations in human cigarette smoking habits. This suggested that examination by an analytic smoking machine be undertaken to discover whether yields of tobacco tar in simulations of these habits might differ. It was found in various experiments that: (a) Smoking a given number of puffs over a long period of time results in greater tar retrieval than smoking them over a short period. (6) Tak ing most of the puffs at the end of the cigarette results in the highest tar retrieval, puffing at regular intervals throughout the life of the cigarette gives the next largest yield, and taking most puffs at the beginning, the smallest retrieval, (c) Puffs taken at the end of a cigarette yield about twice the tar of puffs taken at the beginning. Further research is being conducted on lung cancer and control patients to deter mine possible differences in the extent to which they exhibit high and low tar-retrieval models.