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[0] A careful review of the literature on the various recreational and illicit drugs reveals that: [1] >>More longer-term studies are needed to assess the lasting effects on infants when mothers have taken or are taking illegal drugs. [2] Heroin and methadone cross the placenta; marijuana, cocaine, and phencyclidine (PCP) do not. [3] Mothers should get off heroin (detox) any time they can during pregnancy. [4] 
Methadone withdrawal for infants is less severe and shorter than heroin withdrawal.
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