Brooke is right. But even the best friends, or the logic of an intelligent people, sometimes cannot be enough to get someone to quit smoking or chewing. The addiction is, by design, intense, and stopping isn't easy even for those with the desire. The longer the use, the harder the quitting. Have him visit the people section of this site and read the story about Sean Marsee who died at 19 after being a teenage dipper. It happens. But he will have to want to do this himself.