Longitudinal 10-year study of offspring exposed to marijuana in utero indicated increased hyperactivity, impulsivity, inattention, delinquency and problem-externalization.

Cognitive performance in new-borns of 354 mothers were assessed at 6.5, 12, and 13 months. Alcohol use during pregnancy was associated with poorer cognitive performance. The use of cocaine and tobacco was associated with smaller size at birth. No effects were detected in relation to cannabis use.

(Source: Jacobson SW, et al. Pediatrics 2002 May;109(5):815-25)

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