perhaps the difference is that the dumber kids used illegal drugs earlier in life and are no longer intelligent........
Brian damage isn't actually a side effect of most drugs. Alcohol, yes, meth and ecstacy as well at high enough doses. And as ecstacy isn't that addictive, users realistically aren't likely to take it at high enough doses on a consistent enough basis to do any real damage, maybe a few rolls once a month or so at a party. This contrasts with meth, where the usage pattern almost inevitably degrades into trying to be tweaked every waking second. It's important to note that the common belief that this brain damage takes the form of "holes" is an urban legend. Other than that, it's honestly difficult to think of a drug that has this side effect. Heroin doesn't, it actually doesn't have have many side effects at all besides having a relatively low lethal dose and being the thing in life people seem to least want to stop doing. That is enough to make it more lethal than just about any other drug (I suppose meth friends get to have that final, toothless, laugh). I don't see why anti drug fanatics feel the need to make up additional side effects here. It's like telling me that being hit with an atom bomb might make me susceptible to cardiovascular disease.
As for others, marijuana doesn't cause any long term organic damage (although it has been linked to an increased chance of schizophrenia), LSD doesn't, mushrooms don't, peyote doesn't, cocaine doesn't, thus crack doesn't, benzodiazapines don't. Adderall is theoretically in the same category as meth, ecstacy, and most anything else roasted to amphetamine, but due to it's weak serotogenic properties the required dosage is unrealistically high (you'd have to take weak a whole bottle or something). There are a handful of prescription opiates, but they're much like a mini heroin in this regard. What else even is there besides obscure crap that no one really takes?
I suppose I can give you huffers, but that's just the dumbest drug anyway. I mean, dying of other drugs is like dying a pointless death in some dangerous pursuit, tragic, but you can perhaps understand their thinking. Dying of huffing something is like going out to join some criminal organization but getting lost and drounding in the wishing well instead, a handful of quarters in tow. It's just sad.
Now, I am no longer the drug liberalization radical (judging by internet standards) I once was, but I'm sorry, it still frustrates me how the anti-drug crowd treats the actual truth of their claims as a totally optional affair. Research is for pansies, if you hear anyone at all say something that sounds bad, treat it with total credulity and repeat it as nauseam. Make sure to turn of your common sense. The first time you take them, drugs will come and take your lunch money! Drugs are hiding under your bed! This recession happened because you smoked that joint once!