Cannabis Use Disorder During the Perinatal Period Martha L. Velez, Chloe J. Jordan, and Lauren M. Jansson Chapter 17, in : I. D. Montoya, S. R. B. Weiss (eds.), Cannabis Use Disorders, 2019, © Springer Nature Switzerland AG 2019 177 https://doi.org/10.1007/978-3-319-90365-1_17   Introduction Cannabis use in the perinatal period has been increasing in recent years, coincident with increasing legalization in the USA for medical or recreational purposes [1]. Marijuana is the most commonly used illicit drug during pregnancy [2], and among some populations, it is used more frequently than tobacco [3, 4]. Although the prevalence of cannabis use during pregnancy is difficult to ascertain with accuracy, [...]