It is difficult to ascertain the direct influence of a mother's marijuana use on her developing fetus because pregnant women who use marijuana tend to experience a set of other risk factors such as using other drugs and having limited prenatal care.

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It is challenging to isolate the effects of marijuana use from other confounding factors that often accompany it, making it difficult to determine its direct impact on fetal development.

It Is Difficult to Ascertain the Direct Influence of a Mother's