Alphonse, with regard to any habit, a person first develops a thought to give it a "try." Then, when the person further develops that thought positively, they act upon it. The satisfaction derived from that action leads to the repetition of the action, eventually forming a habit. In a way, the person unwittingly trains the mind to accept the habit. Subsequently, the mind takes control over the person, resulting in the person becoming a victim of the very deed they initially tried. When the person truly desires to break free from the habit due to its detrimental effects, the mind engages in its own deceptive game, providing numerous reasons to maintain the habit.
Unless the individual harbors a sense of guilt and willpower to eliminate the habit, their efforts may go unheard. This insight stems from my experience as a Psychological Counselor. I presume you may be a secondary smoker. I appreciate your concern for our friend.
Regards,
R. Ganesh