The participant may automatically light a cigarette and then realize they did not remember lighting it. It has become automatic. A habit. Breaking the habit can be done by repeatedly interrupting the old behavior.

21 days of interrupting the old habit repeatedly can break a habit.

Example: You are in your car; you automatically light up a cigarette.

Ask participants to tell you how they might change this habit.

(Clean car, drink water, chew gum, deep breathing) remind them again interrupting the old habit repeatedly can break a habit.