At 4 points in time the objects (n = 1204 adolescents) were asked to rate cigarette, marijuana, and alcohol consumption on a 5-point scale.
Data frame with marijuana (POT), cigarette (CIG), and alcohol (ALC) consumption.
1 ... never consumed
2 ... previous but no use over the last 6 months
3 ... current use of less than 4 times a month
4 ... current use of between 4 and 29 times a month
5 ... current use of 30 or more times a month
Duncan, S. C., Duncan, T. E., and Hops, H. (1998). Progressions of alcohol, cigarette, and marijuana use in adolescence. Journal of Bahavioral Medicine, 21, 375-388.
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