If you want the young people to quit smoking, stop drinking, or avoid doing drugs, you should always communicate with them, show concern on their activities. Tell them the truth: It is easier to get addicted but quitting is very hard. Install positive vibes, tell them even though it is hard to quit, they have will power to quit smoking. 
Motivation plays an important role in a teen’s life. Motivate young people to quit smoking, stop drinking and doing drugs. Take an active stance against teen smoking, drinking and drugs and support anti-smoking, anti drugs, and anti-alcohol campaigns. 
Involve your teens in creative activities, and make them believe if they can hold out long, cravings will simply pass away.