Well, I must say they didn't do it with any bad intention. You know drug problem is high in my state. Maybe that's why they exaggerated.
Also isn't ganja much more expensive than cigarette.
The illegal nature of drugs in your state and the exaggerations may very well have something to do with the high drug problem. Refer to my example of countries(i.e Portugal,Netherlands,etc.) who have decided to decriminalize drugs which resulted in a massive drop of drug-related problems. I have a theory,one of the reasons for this massive drop probably has something to do with the fact that a lot of people(especially kids and teens)desire the "Forbidden Fruit." The desire to do something they know isn't allowed. Remove this mystique and a lot of kids and teens lose interest.
That being said,despite my stance on drug decriminalization/legalization,I agree that little kids and teens below 18 should NOT be allowed to do drugs,as doing so could lead to all sorts of problem with their development and often they lack the maturity to practice harm reduction when doing these drugs. For instance,a significant number of people addicted to cigarettes started at a young age. I smoked my first cigarette at 19 when I was already done with high school. I did it,and then did it a few more times and I found that I didn't like it and didn't want to continue with it. (Most people find their first cig unpleasant,their continued use of it is either because of peer pressure or sheer boredom)
I get that the school's intention isn't bad,but it would behoove them to tell them the true facts,that doing drugs at their age could indeed mess with their development(which would be true indeed)and if they really want to do it,its best to wait for the right age. while this probably doesn't remove the "forbidden fruit" mystique entirely,it at least somewhat reduces it. (I for instance,never found much fascination with Alcohol,even though I knew I shouldn't do it as a child. because I knew that once you're an adult,their just another ordinary part of daily life)
Should kids and under aged teens be forbidden from sex? while they should be discouraged,you're probably not gonna stop them if they find themselves an opportunity,so you're a lot better off teaching them how to use contraceptives and condoms to minimize unwanted pregnancies and STD's. again,just my 2 cents.