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Again, I'm not saying there is much difference - just that there are languages that use two separate words for those concepts and don't have a (common) one for both.

For example, in Polish you'd classify aspirin as a medicine ("lek", "lekarstwo") and caffeine as a stimulating substance ("u┼╝ywka"). There is another word that is used to refer to harmful addictive substances like cocaine ("narkotyk"). There is no generally used word in Polish that encompasses all three terms.

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