The word "drug" means anything that, even
in small amounts, produces changes in the
body, the mind, or both. This definition,
however, does not clearly separate drugs
from what we usually think of as food. The
difference between a drug and a poison is
also unclear. All drugs become poisons in
large amounts, and many poisons are useful
drugs in carefully controlled amounts. Is
alcohol, for instance, a food, a drug, or
a poison? It can be any of the three,
depending on how we use it.
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