The spectrum of damage in bodies of cigarette smokers . . . This distribution of somatic cell disease in bodies of cigarette smokers indicates absorption of harmful agents from the respiratory tract, their circulation in the blood, and their excretion, mainly in the urine. . . . The general category of agents most likely to cause the spectrum of disease observed would be mutagens . . . Many carcinogenic agents, some of which are probably mutagenic, have been identified in tobacco smoke, and Polonium 210 . . . Transport of such mutagenic agents .
Tobacco also affects nonsmokers adversely .
Not only, in such societies, is practically everyone exposed to passive inhalation of tobacco smoke, but a very considerable number of 'non-smokers' have once tried . . .