Caveat emptor is not just an old proverb. “Let the buyer beware” is sound advice that the user of illicit drugs would be wise to heed. The buyer of these drugs—most of them clandestinely made—does not know what he is getting.
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Johnson et al. (1972) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: