Prenatal exposure to cotinine was associated with increased risk of schizophrenia.
A prospective study in Finland from 1983 to 1998 has found maternal cotinine levels (one of many toxic substances in cigarette smoking), after adjusting for multiple confounders, conveyed a significant excess risk (2.6 to 3.4 times higher) for schizophrenia. When psychiatric disorders were explored for maternal and paternal histories there was no significant additional risk.
PositiveTip: The evidence is clear: maternal cigarette smoking is dangerous for the physical and mental health of the child.
Pot smoking pregnant mothers likely to use other drugs as well.
A small study of mothers and their newborns found one quarter of those who tested positive for marijuana use also had evidence of other illegal drugs: 11.6% were positive for opioids, 10.6% for amphetamines and 6.5% for cocaine. Data was collected from 2006 to 2010 in an urban teaching hospital with 5000 births per year. About 10% of these tested positive for marijuana use.
PositiveTip: Encourage pregnant mothers to avoid marijuana and other illegal drug use for the good of their unborn infant--and themselves.