You shouldn't let your kids smoke cigarettes.
Jim is a pack a day smoker with a child named Roger, who has expressed interest in trying smoking.
Jim wants to teach Roger a lesson about smoking.
Jim tells Roger about the various adverse health consequences of smoking.
Jim lets Roger try a cigarette, figuring he'll be disgusted by it and stop being interested.
Roger is scared off by all the side effects Jim tells him about and decides he doesn't want to try smoking any more.
Roger ends up enjoying the cigarette and later starts smoking daily.