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. Author manuscript; available in PMC: 2012 Nov 1.
Published in final edited form as: Am J Addict. 2011 Oct 4;20(6):509–515. doi: 10.1111/j.1521-0391.2011.00179.x

Figure 1. Developmental trajectories of marijuana use extending from adolescence to age 32.

Figure 1

Note:

The marijuana use score refers to the following:

0 = none; 1 = a few times a year or less; 2 = once a month; 3 = several times a month; 4 = once a week; 5 = several times a week, and 6 = every day.