Marijuana is the most commonly used illicit recreational drug internationally (Copeland et al. Int Rev Psychiatry 2009;21:96-103). The Youth Risk Behavior Survey conducted by the US Centers for Disease Control and Prevention reported that 23.1% of high school students in the USA used marijuana in the past month, and that 39.9% had used marijuana at least once. Marijuana use is also not uncommon in Western Europe (MacArthur GJ et al. / Public Health 2012;34:i20-i30). Despite its ubiquitous prevalence, research on marijuana use in pregnancy remains limited. Although marijuana has been associated with reduced fetal growth and an increased risk of pre-term delivery in some but not all studies, the use of the drug during pregnancy has generally not been associated with adverse pregnancy outcomes (Smith LM et al. Pediatrics 2006; 118:1149-56; Shiono PH et al. Am J Obstet Gyn 1995;172:19-27). Few studies evaluating these outcomes are available, however.The study by Saural-Cubizolles et al.
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