Parents should state clearly to their teens that they would be very disappointed if they started using marijuana. Most importantly, if you know or suspect that your teen is using drugs or alcohol, act now and review the Action Guide for Parents on this Web site.

Tip #1 — Set clear rules — and discuss in advance the consequences of breaking them. Don't make empty threats or let the rule-breaker off the hook. Don't impose harsh or unexpected new punishments.

Tip #2 — Punishments should involve mild, not severe, negative consequences. Overly severe punishments serve to undermine the quality of the parent-child relationship.

What encourages a kid more than his or her parents' approval? The right word at the right time can strengthen the bond that helps keep your child away from drugs. Emphasize the things your teen does right and restrain the urge to be critical.

Reward good behavior consistently and immediately. Expressions of love, appreciation and thanks go a long way. Even kids who think themselves too old for hugs will appreciate a pat on the back or a special treat.

Accentuate the positive. Emphasize the things your teen does right. Rein in the urge to be critical. Affection and respect - making your child feel good about himself - will reinforce good (and change bad) behavior far more successfully than embarrassment or uneasiness.