The aggressive merchandising methods of the manufacturers and distributors of cigarets have given an impetus to their use in hitherto unconsidered directions. The claim has been made in many advertisements that particular types of cigarets differ in their toxic effects from others. Many smokers have asserted that they recognize marked differences in the irritating properties and other effects of the smoke of different brands of cigarets. Since so many persons, although acknowledging the deleterious effects of the habit, find it impossible to refrain from smoking cigarets, information regarding the relative toxicity of different kinds of cigarets is of practical value.
More than 286 brands of cigarets have been found on the American market, and new ones are being introduced all the time. The classification of cigarets presents many difficulties. It is possible, however, to recognize the pure oriental cigarets made of Turkish and Egyptian tobacco, the pure domestic brands made