A short form of the MWC (Budney et al. 1999) was used to assess withdrawal symptoms at baseline and after abstinence. The MWC is sensitive to the effects of marijuana abstinence (Budney et al. 1999) and has demonstrated good inter-item reliability (Budney et al. 2003). The short form used asked participants to rate nine symptoms on a scale from 0 (“none”) to 6 (“severe”).
