There’s no sure way, but help can be found in many places.
Be sure to expose your child to anti-smoking advertising campaigns. If you find a magazine ad that makes smoking cigarettes look disgusting, cut it out and give it to your teen.
Help your child find anti-smoking websites and look at them together. Remember that kids aspire to be like those perceived to be cool. If cool kids don’t smoke, this can serve as a very positive influence.