I might have told this story before, but my parents both quit smoking around 1974, when cigs hit $6 per carton (in Canada). My dad, who was a 2-pack-a-day smoker, quit cold turkey, never smoked again and doesn't crave it. My mother only smoked about 3 cigarettes a day, and only while socializing or relaxing. To this day, she still has dreams about enjoying a cigarette.
They smoked for different reasons. For my dad, smoking was a compulsive habit he was tired of. For my mom, smoking was synonymous with pleasurable events.