It is a matter of precaution only." John turned to me, taking out his cigarette-case, and lighting a cigarette as he did so. 
John was addicted to smoking and went through a pack a day.
mnli hypothesis: John was addicted to smoking and went through a pack a day. 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. 