A teratogen is any agent that causes structural damage in the fetus during pregnancy, typically by exposing the unborn infant to the mother's ingestion of these agents. Examples include:

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Teratogens include a wide range of substances that can cause birth defects or developmental issues in a fetus. This includes alcohol, cigarette smoke, drugs of abuse, marijuana smoke, and certain prescription drugs, all of which can harm the developing fetus if the mother is exposed during pregnancy.

A Teratogen Is Any Agent That Causes Structural Damage in the Fetus