My brother tried the same thing at around the same age, when my dad found out he sat down with him and made him chain smoke until he was sick. It worked for him, he's 48 and never smoked another cigarette in his life. Just a thought!

If he was mine however I would ask him to make a list of good things about cigarettes and a list of bad things, you can guarantee the bad will outweigh the good by a mile. It might be enough to convince him.