Swear words and violence don't cause addiction, alcohol can but it's way less likely and also easier to restrict... idk why a kid should have cigs even once though
there may be valid use cases in certain demographics eg the disabled. to me it is evidently advantageous teaching a teenager how to have a smoke or have a drink properly , so that they don't go overboard with self directed learning for a valid activity (loosening social inhibition). we could totally teach teenagers the generation and consumption of dispassionate violent relationship simulacra. may I ask what would be advantageous about this ?