METHODS: We utilized the NIS database from 2002 to 2011, ages ≥ 18 years (66268963 admissions). The variable “cannabis use=1” was computed with the discharge diagnoses equal to any of the ICD-9 codes “304.30”, “304.31” and “304.32” (unspecified, continuous and episodic use, respectively). Prevalence of cannabis use in this 10-year snapshot, as well as its yearly incidence, were analyzed in correlation with age groups, gender, insurance, race, income classes, and pregnancy status. Continuous variables were analyzed using t-tests and ANOVA for trends. Categorical/ordinal variables were analyzed with the chi-square test and Cochran-Armitage test for trend.