What illegal substance,when used by pregnant women,led to an epidemic of thousands of "crack babies"?

Question

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When pregnant women use cocaine, it can cross the placental barrier and lead to a range of negative health outcomes for the developing fetus, including low birth weight, premature birth, and developmental delays. In the 1980s and 1990s, there was an epidemic of "crack babies" in the United States, characterized by infants born to mothers who had used crack cocaine during pregnancy.

What Illegal Substance,when Used by Pregnant Women,led to an Epidemic