A proposed rule sent Thursday to the federal register recognizes medical uses of cannabis and acknowledges it has less potential for abuse than some of the most dangerous drugs.
Just because something psychoactive grows in nature doesn't mean it is not a drug. Anything that has a physical or psychoactive effect, or anything at all beyond nutrition, is a drug. DMT, Salvia, Psilocin, Mescaline, Phenethylamine, Opium, these are all indeed drugs.
The reason you said this is because the word drug has a (very unfair) negative association because it is used as a blanket term to describe the reason someone acts a certain way on them, therefore making it seem that all drugs are bad (drugs, like anything in life, are only bad if you abuse them).
I tend to associate the word drug with something made in a lab for a medicinal or elective purpose. Hence why we call pharmacies "Drug Stores" and not "Herbal Stations"
there is a very specific legal definition of a drug which the FDA has clarified as anything that is intended to diagnose, treat, cure or prevent any disease.