Cannabis use by women during pregnancy does not influence infant DNA methylation of the dopamine receptor DRD4.

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“Associations between cannabis use and offspring DNA methylation have not been investigated; however, maternal tobacco smoking in pregnancy is associated with distinct patterns of DNA methylation at birth and beyond. To determine whether maternal cannabis use is associated with methylation of the dopamine receptor gene DRD4 promoter in infants. There is no strong evidence that maternal cannabis use in pregnancy is associated with offspring DRD4 methylation.”  https://www.ncbi.nlm.nih.gov/pubmed/28448718

“There is no strong evidence that maternal cannabis use in pregnancy is associated with offspring DRD4 methylation.”  http://www.tandfonline.com/doi/abs/10.1080/00952990.2017.1314488?journalCode=iada20