You can find it in the cult movies section at the video store. Maybe they had political aspirations. They trick the kids into smoking pot by telling them it's just regular tobacco. The kids, who apparently aren't very bright, never notice the difference. The kids proceed to kill each other, jump out of windows, drive really fast and engage in other activities that are totally inconsistent with the effects of marijuana.
People continue to fear marijuana in spite of studies that show the fear is unwarranted.
Even if you aren't interested in this subject, I recommend the movie anyway. It is truly hilarious. There have been numerous scientific studies that have suggested marijuana is no more harmful or addictive than alcohol or cigarettes. But the federal government refuses to make marijuana available to those who need it because there is a stigma attached to marijuana that makes it socially unacceptable. In my personal experience, I have found alcohol to be much more dangerous than marijuana.