Intrauterine cannabis exposure and fetal and maternal blood flow: a case–control study

Abstract Introduction: Cannabis consumption during pregnancy increases the risk of pregnancy and neonatal complications. Since the underlying mechanism is unknown, the purpose of this study is to evaluate the changes in maternal and fetal blood flow in pregnancies exposed to cannabis, Δ9‐tetrahydrocannabinol (THC). Material and methods: A case–control study between 2013 and 2020, included women with continued cannabis exposure during the pregnancies, defined by qualitative detection of THC in urine (Cannabis Group), and low‐risk pregnancy women divided into tobacco smokers