This paper is the continuation of previously published work, a review limited to studies on rats and mice. This paper makes an identical evaluation as before, but, restricting the species being evaluated to representative studies of smoke-exposed hamsters, dogs (both by tracheostomy and by direct inhalation), and nonhuma n primates. As was seen previously, no statistically significant increase in the incidence of malignant tumors of the respiratory tract was found in any of the 3 species, even though very long exposures and high doses of smoke were used. All 5 of the species of laboratory animals commonly used to evaluate carcinogenic potential produce results with mainstream cigarette smoke that are at variance with the epidemiological evidence in smokers.
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