al. 2002; Langenbucher et al. 2004; Lynskey and Agrawal, 2007; Martin et al., 2006; Gillespie et al. 2007) similarly found better fits for a model specifying a unidimensional latent trait of cannabis use disorder severity. These studies also identified few diagnostic criteria that discriminated at the milder levels of the cannabis use disorder severity continuum. These results highlight the critical need to develop better dimensional measures that discriminate across the entire spectrum of severity, including components that represent milder cases.