There is all the difference in the world between drug use, and drug abuse.
The problem with that, is that so many use the drugs thinking they won't get hooked and then do. Highly addictive drugs like cocaine and meth gets kids in over their heads so quickly, they don't even realize it till it's too late. While these "bath salts" and "jewelry cleaners" don't need a second time to do the damage. The jewelry cleaner has something in that fries your brain for days!
Yes, anything done to excess can be bad for your health, but most of them don't get you physically addicted to them.