Figure 9 is titled "Serious Mental Illness, by Type of Substance Used among Adults Aged 18 or Older: 2002." It is a bar graph, where the horizontal axis represents percent with serious mental illness and the vertical axis represents type of substance used. There are twelve categories of substances used: methamphetamine, crack, cocaine, psychotherapeutics, inhalants, any illicit drug other than marijuana, hallucinogens, any illicit drug use, marijuana, cigarettes, past month heavy alcohol use, and no illicit drug use. For each category of substance used, the percentage with serious mental illness is as follows:

Of those who used methamphetamines, 31.8% have serious mental illness (SMI).
Of those who used crack, 29.9% have SMI.
Of those who used cocaine, 22.0% have SMI.
Of those who used psychotherapeutics, 21.8% have SMI.
Of those who used inhalants, 20.6% have SMI.
Of those who used any illicit drug other than marijuana, 20.5% have SMI.
Of those who used hallucinogens, 19.7% have SMI.
Of those who used any illicit drug, 17.1% have SMI.
Of those who used marijuana, 16.7% have SMI.
Of those who smoked cigarettes, 13.0% have SMI.
Of those with past month heavy alcohol use, 11.1% have SMI.
Of those with no illicit drug use, 6.9% have SMI.

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This page was last updated on May 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.