Inadequate or Inconsistent Data

"Since marijuana crosses the placenta, it is reasonable to think that it may have a direct, adverse effect on the fetal brain or on fetal growth, but the small number of studies performed to date have failed to identify major birth defects or a consistent effect on neurobehavioral function. Results regarding the relationship of prenatal marijuana exposure to lowered birth weight are inconsistent."

Source: 

Zuckerman, Barry, "Drug-Exposed Infants: Understanding the Medical Risk," The Future of Children (Princeton, New Jersey: Princton University, Spring 1991) Volume 1, Number 1, p. 33.
http://futureofchildren.org/fu...

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