Abstract
Yields in sidestream smoke (SS) and mainstream smoke (MS) and sidestream smoke to mainstream smoke distribution ratios (SS/MS) of 34 bases were examined from four types of cigarettes made from bright, Burley, Turkish and domestic (c.v. Matsukawa) tobacco. Irrespective of tobacco variety, major bases in sidestream smoke were ammonia, nicotine, 3-vinylpyridine, pyridine and 3-hydroxypyridine, and those in mainstream smoke were nicotine, 3-hydroxypyridine, ammonia, 3-picoline and pyridine. SS/ MS ratios of the bases were generally larger than 1.0 and the largest SS/MS ratio was that of ammonia, followed by those of 3-vinylpyridine, 3-cyanopyridine, nicotyrine and pyridine in that order. The preponderance of bases in sidestream smoke over mainstream smoke might be one of the major causes for the differences in aroma and irritation between sidestream smoke and mainstream smoke.