Saying no may be harder then it seems. A lot of times drugs are introduced by someone you know. Do not worry though peer pressure can easily be refused. Watch this video for some ideas.
In groups of three to four create a scenario where an individual is in a situation being pressured to used drugs. Your group must create a realistic scenario and then present it to the class with a solution. Your group must demonstrate at least two ways to avoid a risky situation. Be creative with your examples, you may use the internet to find more solutions if needed, here are some more.
Npr podcast on how drugs affect children.