Abstract
In 1957 Keith and Newsome concluded from an experiment that the efficiency of the combustion process, i. e. the relative smoke yield, is independent of the distance between the incandescent zone and cigarette tip. It is shown in the present paper that the results set forth by Keith and Newsome are void of the theoretical accuracy which, in view of the relevance of such results, should perhaps form the basis of interpretation. From the alleged constancy of the relative smoke yield the author of this paper draws theoretical conclusions the verification of which will facilitate, in a reliable way, the decision upon the truth of the said allegation. An empiric examination of the author's conclusions is recommendable.