Cannabis use by mothers or fathers during pregnancy, or even only before pregnancy, is associated with an increased risk of psychotic-like episodes in their children, a Dutch study suggests.
Because pot use by mothers and fathers carried similar risk, and a mother’s use before pregnancy had the same effect as use during pregnancy, the study team speculates that parental pot use is likely a marker for genetic and environmental vulnerability to psychotic experiences rather than a cause, and could be useful for screening kids at risk for psychosis later in life.
Babies exposed to cannabis in the womb do have an increased risk of being underweight and unusually small when they’re born and developing cognitive and behavior problems early in life, the researchers note in a paper in the journal Schizophrenia Research, online July 6. Cannabis can also cause hallucinations in adults, particularly with frequent use and at high doses, but less is known about the potential for infants exposed to the drug in the womb to develop psychotic-like symptoms.
For the study, researchers examined data from questionnaires asking 3,692 10-year-olds whether they had symptoms that are similar to what adults might experience with psychosis: hearing voices that nobody else detects, seeing things others don’t see, and having thoughts that others might find strange.
They also examined mothers’ reports on their own marijuana use as well as any use by their partners, and they also looked at lab tests for signs of cannabis in mothers’ urine.
When mothers used marijuana during pregnancy, children were 38 percent more likely to have these psychotic-like symptoms than the children of mothers who abstained from use during pregnancy, the study found. But children of mothers who used pot only before, but not during, pregnancy also had a 39 percent higher risk than the kids of mothers who didn’t use it.
Fathers’ cannabis use during pregnancy, meanwhile, was associated with a 44 percent greater likelihood of psychotic-like experiences in their kids.
“Some children with psychotic experiences are at increased risk to develop psychosis or other psychiatric disorders,” said lead study author Dr. Koen Bolhuis, a researcher at Erasmus Medical Center Rotterdam in the Netherlands.
https://www.psychcongress.com/news/pot-smoking-parents-tied-risk-psychotic-episodes-kids