Cannabis use disorder (CUD) among individuals hospitalized during pregnancy increased significantly between 2010-2018, and this population may also be at an elevated risk for other psychiatric illnesses. Among a sample of nearly 21 million prenatal hospitalization records, 2% involved a pregnant individual with a diagnosis of CUD in 2018, compared to 0.8% in 2010. Pregnant women with CUD were also more likely to experience co-occurring depression or anxiety. Further research is needed to better understand the relationship between the use of cannabis and mental illness – especially among vulnerable populations such as pregnant women – and how targeted interventions can improve health outcomes. To learn more, see the study in JAMA.