WHY IT MATTERS: Pregnant patients currently using cannabis for nausea or anxiety should understand that new preclinical evidence suggests THC exposure may alter placental biology in ways potentially linked to long-term neurodevelopmental risk in their children. CLINICAL OVERVIEW: Emerging preclinical research is examining how prenatal THC exposure may leave biological signatures in placental tissue that correspond to markers associated with schizophrenia risk. The placenta, long underappreciated as a clinically meaningful organ, appears to respond to cannabinoid exposure in ways that could influence fetal neurodevelopment through epigenetic and inflammatory pathways.