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A related question:

Why are pharmacies in the US called Drug Store's?

There was also a time when people could get substances like cocaine over the counter. That was also the time when Coca-Cola contained actual cocaine as an ingredient.

Drug stores are called pharmacies in the US also (& apothecaries)
It's where people buy legalized drugs or drugs prescribed by an allopathic doctor. D mystery 4 Americans is why drug stores also sell everything else like at a grocery store.

The definition of a drug is "a medicine or other substance which has a physiological effect when ingested or otherwise introduced into the body." That would include things like nicotine, caffeine and of course, THC.

Ignorance

Exactly, but some Individuals won't still agree on that.

Both are strong messages out there which many align with one or the other.