Oxycodone was pitched as non-addicting. Opioids generally were pitched as non-addicting because they were by prescription, under control of doctors. That protection scheme obviously failed miserably.
Oxycodone was created by a pharmaceutical company and marketed in a way that would earn them a profit.
Marijuana and psilocybin have been around for literal ages with widespread use. LSD and ketamine are synthesized, but we have decades of experience with them.
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