I wrote the word "Drugs" in a circle and made a web as we brainstormed all different types of drugs. I'm always saddened at how much they already know about drugs. I even tell them that medicine is a drug. They are always shocked to hear about that.
At the end of our brainstorming session, I tell them why people take drugs and why it's so hard for people to stop. My message is clear- DON'T EVER TAKE DRUGS!
We also discuss all the different reasons why drugs are BAD!
I always follow up with a great book called, "Smoking Stinks!"