E-1 Quinoline and naphthalene

In 1970, Kaburaki et al. (2006) reported the results of their detailed study of the pyrolysis of nicotine at various temperatures in air and in an inert atmosphere (nitrogen). They did not report the identification of the two tumorigenic benzacri-dines reported previously by Van Duuren et al. (4027) as identified components in their nicotine pyrolysates. 

From their study of the pyrolysis of several nitrogenous components of tobacco, including nicotine, Schmeltz et al. (3499) reported  

We could not detect benzo(a)pyrene in nicotine pyrolyzates, nor could we confirm the presence of the physiologically active dibenzacridines and dibenzcarbazole [sic] reported in tobacco smoke and in nicotine and pyridine pyrolyzates by Van Duuren [4027]. 

In their review of the pyrogenesis of tobacco smoke components, Chortyk and Schlotzhauer (722) emphasized these reported findings, that is, the failures of several groups 

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