The booklet presents a skeptical, conversational appraisal of commonly asserted health dangers of tobacco, combining personal anecdotes with critical review of medical opinion and literature. It questions causal claims linking smoking to specific ailments, highlights individual idiosyncrasies and confounding factors that complicate statistical proof, critiques weak or anecdotal arguments against the habit, and surveys medical doubts and limited experimental evidence. The author also touches on social and aesthetic objections to smoking and on difficulties of designing definitive human experiments, ultimately arguing that many alleged harms are asserted without conclusive scientific demonstration.