Focus on the social issues. Young people are often more concerned about these. Talk about the smokey cigarette smell in their hair, and on their clothes and breath. Help them understand the financial costs of smoking. Remind them that most young people don't smoke.
Many youth believe that all the other kids are doing it.
Look at advertising. Talk about situations and how they would react. Praise their efforts. Trust them to make good decisions. Acknowledge the pressure they may feel to try tobacco.