Know what else causes it?
Outlawing natural drugs that are known and creating a market for rogue chemists to create ghastly synthetics. These would never exist if cannabis and coca were legal.
The equivalent of “cocaine crazed negroes” now exist but only because cocaine was made illegal
Cannabis and coca are already available and synthetics are illegal too. So why are they choosing synthetics over the “natural” drugs? People are always looking for something more. If not, they would just use alcohol since it’s already legal.