Also everything is a drug. Food, water, whatever.
Try living with long-term chronic pain, disability and flaky mental health. Then tell me it's all in the mind.
This isn't quite in line, as it's about the 1960s when they were going mad with new drugs, IIRC a sleeping pill was sold that had a barbiturate shell that knocked you out. This was designed to take ~8 hours to dissolve away, and at the core was a lump of amphetamine to bounce you back to eager wakefulness.
Granted people were a bit naive back then but it must have been obvious such things were not intrinsically safe, but dammit we have sales targets!
I worked in the area and I remember being told a story about a drug being approved for use based on the word of the top exec of the drug's manufacturer that it was safe, and a handshake. That's all. This would be in the late 70's. Things have been very much tightened up since then, but still.
Try keto/low carb diet for a few weeks and see what it does to your brain/mood/alertness.
Every time you eat some bread you literally pop a pill. ;)