It is a matter of precaution only." John turned to me, taking out his cigarette-case, and lighting a cigarette as he did so. 
He had never imbibed in smoking during his whole life.
mnli hypothesis: He had never imbibed in smoking during his whole life. premise: It is a matter of precaution only." John turned to me, taking out his cigarette-case, and lighting a cigarette as he did so. 