On the burning temperatures of tobacco.

Experimental studies in which tobacco tar has produced malignant tumors on the skin of the mouse seem to imply that a chemical carcinogen is formed by the combustion of tobacco leaf. Among the most important factors affecting the chemical structure of the smoke is the burning temperature. Not only does knowledge of this factor become essential for a study of the possi bility that carcinogenic aromatic hydrocarbons are produced in this process, but the experiments described below have been performed to elucidate differences among smoking habits and to per form suitable animal experiments that simulate the process of smoking.