We've said it before: it's okay to lie to save children from marijuana. But another equally important piece of the anti-drug puzzle is the almost-lie, or half-truth. For example:
"According to the National Center on Addiction and Substance Abuse (CASA) at Columbia University, teens who use drugs are five times more likely to have sex than are those teens who do not use drugs. CASA also states that teens who have used marijuana are four times more likely to have been pregnant or to have gotten someone pregnant than teens who have never smoked pot."
The general idea is to show that some people who have used marijuana have also done other bad things, and then hint that the marijuana caused the other bad behavior. I'm sure some marijuana-smoking philosophy student would call this some sort of fallacy with a Latin name, and then liken it to the idea of obesity causing over-eating, but we just call it an "anti-drug".
Another big part of the half-truth is to leave out pieces of information that aren't helpful to your goal:
"Kids can get hooked on pot. Research shows that marijuana use can lead to addiction. More teens enter treatment for marijuana abuse each year than for all other illicit drugs combined."
See? It doesn't matter that most of the teens entering these programs aren't habitual users. It doesn't matter that most of them are coerced into the programs by courts or school zero-tolerance programs. It's more than enough to merely say they are in the treatment programs, and then use this as evidence that marijuana is highly addictive.
It may seem wrong to lie and distort the truth, but it's not really. After all, you might be saving someone from being high.