sample="quota" bates="1001517814" isource="pm" decade="1970" class="ni" date="19720602" DICFT respectively. The effects that salt casing produce such as lowered TPM and, in this study, lowered HCN cannot be accounted for by differences in mainstream tobacco consumption. This subject is still under investigation. CHARGE NUMBER: 0108 PROGRAM TITLE: MECHANISM FOR SMOKE FORMATION PERIOD COVERED: April 16 - May 15, 1972 PROJECT LEADER: W. R. Johnson DATE OF REPORT: June 2, 1972 I. TOLUENE: BENZENE RATIONS IN CIGARET SMOKE Toluene: benzene ratios in cigaret smoke have been previously reported to be 2.2 in the sidestream smoke and 11.2 in the mainstream smoke of burley, bright, Turkish, and LY 1R1 cigarets. However, the values obtained for a cigaret made of pipe tobacco were 3.7 and 1.6 for the two streams. In order to establish whether these differences were due to substrate composition or physical differences present during smoking, all fillers above were pyrolyzed at 700ºC. Within experimental error, ratios were identical, being 1.15, 1.17, 1.13, and 1.18 for bright, barley, Turkish and pipe tobacco respectively. On this basis, differences are attributed to physical conditions (e.g. temperature) rather than to filler composition. Kentucky 1R1 filler was pyrolyzed at temperatures of 600-950ºC at 50º intervals. A plot of the log of the absolute temperature vs the log of the toluene benzene ratio yielded a straight line of slope -0.11. The absolute temperature and the ratios are related by the equation: formulaname This equation can be compared to one derived from the thermocouple measurements of peak coal temperatures: formulaname From the log, log plot, the average temperature of formation of benzene and toluene can be determined to be 586ºC for sidestream smoke from a cigaret made from pipe tobacco (ratio = 3.7) and 727ºC for mainstream smoke from a handmade 600mg cigaret made of Kentucky 1R1 filler (ratio = 0.9). II. PYROLYSIS OF MH-30 More than forty-five products have been identified in the pyrolysis of MH-30 (maleic hydrazide). A summary of this work has been compiled. Studies related to mechanism of breakdown continue. The search for hydrazine continues to avail. W. R. Johnson /ad