I think for some people, the root of the behavior is addiction. A relative of mine was told by their trusted doctor that they have to quit smoking, or else it

I think for some people, the root of the behavior is addiction. A relative of mine was told by their trusted doctor that they have to quit smoking, or else it would kill him. My relative expressed the idea that he'd rather lose a day of his life (possibly longer) for each cigarette he smoked than have to give it up. He was addicted. He couldn't kick the habit. And I have never smoked a thing because of that, either out of fear for me getting addicted myself, or just as a lesson learned that it's a lot easier to avoid the addiction than fight it once it's latched onto you.