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Published 2014
Until Paracelsus and his chemist successors, our pharmacopeia was plant-based, but that did not mean all plants were good for you (see food poisoning). As proof of this, belladonna (deadly nightshade) was used as a painkiller, and served as a useful poison in imperial Rome. But it is also a strong hallucinogen (mixed with opium it could make witches fly), so long as you get the dose right (now is not the time to experiment).