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PHILIP MORRIS U.S.A. NTER-OFFICE CORRESPONDENCE Nicotine and TPM Availability with Filter Dilution. results show that the increase originates in the rod-. caused by a filter phenomenon or by a rod phenomenon. The An experiment was run to determine whether the increase . in nicotine-to-TPM ratio with~ increasing filter dilution is very slightly with increasing dilution: As shown below, filter efficiency for each~component drops .Nicotine and TPM filtration efficienc ies were determined ~ for Monitor #14 filters having 0, 22, and 42% filter dilution. < Available nicotine and TPM were calculated as the sum S increase in nicotine-to-TPM ratio. 0% 22% 42% Filtration Effic ienc Nicotine TPM 3 7% 4 3% 36% 43% 35% 42% .These slight changes in efficiency cannot account for the ~of that removed by the filter plus that delivered to the Cambridge pad for each component. The "available" and "delivered" dilution in the same manner as the "available" ratio. (The .The "delivered'" ratio is found to respond to increased filter ,:nicotine-to-TPM ratios are plotted versus dilution in Figure 1. .correlates with the filter dilution effect described'here. :< O machine causes an increase in the nicotine-to-TPM ratio, which O' Lendvay has found that reducing puff volume on the smoking -. ~-b : in nicotine-to-TPM ratio w ith increased filter dilution. A. T. likely a coal phenomenon -- is responsible for the increase nicotine-to-TPM ratios shows that a rod phenomenon -- most . __for TPM.) The agreement between "available" and "delivered"_- filter efficiency is only 35-37% for nicotine versus 42-43% "delivered" ratio is higher than the "available" ratio because /ad Mr. F. E. Resnik Mr R N! Thomson . . . Mr. J. S. Osmalov J ~~ Mr. A. T. Lendvay Filter Dilution .

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