How can deal with teenagers to convice them the smoking not good

rebellious
stag
for teenager

Try this, but keep in mind that if a teenager wants to smoke, even if you threaten to stab them with a knife if they smoke, they're still going to do it.

http://www.perkel.com/politics/issues/smoke.htm

Take them down to the morge when they are doing an autopsy and see a lung after someone has been smoking for a long time. Then take them home and have them smoke pack after pack until they turn green and sick-bet they won't touch another one!!!!

Don't smoke yourself and be nice to them... they'll probably learn to look up to you and want to talk about the reasons.

Punishing them and getting angry about it will just teach them to like you less, and they will do it more secretively. Remember teenagers trust other teenagers or adults they admire, not necessarily their teachers or parents.