The consequences of breaking them should be clear. Be a good role model. Actions speak louder than words. Be the person you want your children to be. Discuss the consequences of tobacco, alcohol, and drug use.
Tobacco is addictive.
It yellows teeth, fouls breath, and kills. Drugs alter judgment and perspective, and interfere with physical, emotional, and social growth. They are also addictive. Know what your children are doing. Know what they do in school and after school.