Have a Huge black poster, like those motivation ones

Motivation Poster
But have a giant green pot leaf . Have the first formal line say MARIJUANA
Then for the second line "Drugs are bad mmkay"-Mr. Garrison or whatever his name is

-Pot leaf
If your good just draw it but contruction paper, those huge cardboard three fold poster would be AWESOME. Remember basically black background out like the square picture of the nice bright green pot leaf. and white writing, first like in big capital bold letters and the second in smaller unbold capital letters.
But boasting about your poster will make it the best say to your friends "mine is the best simply put, yours all suck and mine if i let it open will take over the war on
drugs and eliminate them", first when presenting it address the teacher, or ask to present, when asked why you want to say i believe my poster is well put together and i took a lot of time and would like to present it, When you get up in front of the class, say WITH THE POSTER FOLDED*KEEP THE POSTER A SECRET now say "i believe my poster will really connect with my peers, it sends a strong anti
drug message and manifests the danger of drugs!
Dude your teacher will fucking hate you, your class will be shitting your pants and you can either stand there and look serious or smile. For added kick i would read off the picture and explain.
Like say, Here is a picture of the most popular
drug abused in america, MARIJUANA. I know the bottom part so (choose a peer) and ask him to read it.
GOOD LUCK BROTHER