Some of the things people are putting into their bodies nowadays are, simply put, poisons and toxins, not drugs.
Some poisons are just that, poisons, and have no recreational value. Someone who imbibes them will do immediate, permanent, severe damage to their body and mind.
Now, the fact that someone can take a product like bath salts and ruin their lives with it in a single dose, doesn't mean that bath salts should be banned, any more than gasoline.
Poison is poison. Kids nowadays seem like infants, they'll just put anything into their mouth, regardless of the dangers. It's insanity and it speaks to a level of hopelessness which society shouldn't be encouraging.
There are any number of these toxins sitting around in society. Why can't kids be taught to look before they leap? Why can't they be raised to educate themselves before undertaking such self-destructive acts?
I mean, hell, for all I know, downing a spoonful of plutonium might make you have an intense trip, but is it worth it?
Wait just a minute - anticancer drugs are poisons - they target cells that are dividing and so the fast growing cancer tissues are more susceptible than slow growing cells.
Same with some drugs for cardiac arrythmias - they poison pacemaker cells so as to allow only one cell to be the pace-setter and re-establish sinus rythym.
So technically, you are incorrect, poisons can be drugs and the other way around.