Prevalence and Risk Factors for Cannabis Use in Low-income Pregnant Women in São Paulo, Brazil

Cannabis is the most commonly used illicit drug during the perinatal period and has potential risks to the fetus. The purpose of this study is to estimate the 1-year prevalence of cannabis use and identify associated factors for a population of low-income pregnant women in Brazil. We performed a cross-sectional analysis of 831 women surveyed using a structured questionnaire to collect sociodemographic, clinical, and substance use history. The 1-year prevalence of antenatal cannabis use was 4.2 %; reported lifetime use was 9.6 %. The presence of a common mental disorder and active tobacco smoking were independently associated with cannabis use, OR = 3.3 (95 % CI 1.65-6.59) and OR = 6.89 (95 % CI 3.45-13.8), respectively.