Sorry but he is the one that'll get lung cancer if he dosen't stop. Pureswade him to stop by reminding him all of the nasty side affects that could happen to him.
3 of my friends smoke and they are 11. all girls. i told them that its themselves there damaging, but they started swearing at me, they only smoke becasue they think there hard and thta its cool to smoke. but its not.
Try asking them why they smoke. and maybe you should tell someone about it....