Quack:
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A practitioner who suggests the use of substances or devices for the prevention or treatment of disease that are known to be ineffective.
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A person who pretends to be able to diagnose or heal people, but is unqualified and incompetent.
https://www.medicinenet.com/quack/definition.htm
Maybe we should start using that term more often.
I already refer to physicians as quacks, knowing their education teaches them nothing more than to peddle prescription drugs, and take orders from insurance companies who would rather them put you on prescriptions than do the necessary tests to find the root cause of the problem and fix it.
Ask your pusher about the purple pill!