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. Author manuscript; available in PMC: 2016 Apr 1.
Published in final edited form as: Am J Addict. 2016 Mar 16;25(3):203–209. doi: 10.1111/ajad.12361

Figure 1. Developmental Trajectories of Marijuana Use Extending From Adolescence to Mean Age 43.

Figure 1

Note: The marijuana use measure at each point in time had a scale coded as none (0), a few times a year or less (1), once a month (2), several times a month (3), once a week (4), several times a week (5), and daily (6).