As a primary goal of this study was to investigate racial differences in cannabis involvement, Cox regression analyses testing the interaction of race and trauma type were conducted. As race was revealed as a significant predictor of both cannabis initiation and transition to a CUD symptom and significant interactions were found for race with sexual abuse, physical abuse, and experiencing an accident, further analyses were stratified by race to investigate the unique trauma-related etiologic models for cannabis involvement in EA and AA subsamples.