Chapter 3's Figure 3, a line and marker chart, presents three graphs contrasting self-reported any weekly use of illicit drugs (heroin, cocaine, and marijuana) in 1992 for the high-risk sample by age. Reported weekly use of marijuana declined in a linear fashion starting at age 20. Reported weekly cocaine use increased from age 20 until the mid-30s, then declined after the late 30s. Heroin use was lower in the younger population but increased after the early 40s.

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This page was last updated on June 16, 2008.

SAMHSA, an agency in the Department of Health and Human Services, is the Federal Government's lead agency for improving the quality and availability of substance abuse prevention, addiction treatment, and mental health services in the United States.