“…A vast amount of literature has appeared on tobacco and its combustion products, and over the years many books and reviews have appeared (27,59,75,76,85,136,140,168,293,306,318,389,390), an authoritative guide to the earlier literature of tobacco chemistry being Brückner's Biochemie des Tabaks (27), whilst an extremely useful and comprehensive bibliography of the literature on smoke has recently been published (10). There is an increasing interest in the chemical constituents of tobacco and the transformations occurring during its processing, the seed and the immature plant receiving less but a not inconsiderable amount of attention.…”