The five response options were then collapsed into three mutually exclusive categories
with scores of 1 (past week) and 2 (past month)
forming the ‘‘current use’’ category (i.e., use within the
past month), scores of 3 (past year) and 4 (more than a
year ago) forming the ‘‘past use’’ category (i.e., previous,
but not current use), and a score of 5 (never) forming the
‘‘never used’’ category (i.e., participants denied ever having
used the substance)