A careful review of the literature on the various recreational and illicit drugs reveals that:

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Studies on the effects of marijuana and cocaine use by mothers are somewhat contradictory.More,longer-range studies are needed.Just about all of these drugs cross the placenta,including marijuana,cocaine,and PCP.Drug withdrawal is accompanied by fetal withdrawal,which can lead to fetal death.Therefore,detoxification from heroin is not recommended,particularly later,in pregnancy.Methadone withdrawal is more severe and more prolonged than heroin withdrawal.

A Careful Review of the Literature on the Various Recreational