Participants reported whether they ever used cannabis in their lifetime, and how long it had been since their last cannabis use. Participants who reported using cannabis “Within the past 30 days” or “More than 30 days ago but within the past 12 months” were categorized as past year users in a new dichotomous variable. Participants indicating past year use reported the number of days they used cannabis in the last 12 months. Participants who reported using cannabis on 300 days or greater were classified as “daily users” (Budney et al., 2003, 2007b; Moore and Budney 2003; Whitlow et al., 2004), while those reporting use on 299 days or less in the past year were classified as “non-daily users”. A three-level variable for cannabis use was created to categorize respondents by frequency of past year cannabis use: 0=no use, 1=non-daily use, 2=daily use.
