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Source: Monitoring the Future, Vol II (2009), Tables 5-1, 5-2, and 5-3, pp. 148-154
| Ratios of Heroin Use vs Marijuana Use Among 19 to 28 Year Olds (1986 - 2008) | |||
|---|---|---|---|
| Year | Lifetime | Past Year | Past Month |
| 1986 | 0.02 | 0.005 | 0.005 |
| 1987 | 0.02 | 0.006 | 0.005 |
| 1988 | 0.02 | 0.006 | 0.006 |
| 1989 | 0.02 | 0.007 | 0.006 |
| 1990 | 0.01 | 0.004 | 0.007 |
| 1991 | 0.02 | 0.004 | -- |
| 1992 | 0.02 | 0.008 | 0.008 |
| 1993 | 0.02 | 0.008 | 0.007 |
| 1994 | 0.01 | 0.004 | 0.007 |
| 1995 | 0.02 | 0.015 | 0.007 |
| 1996 | 0.02 | 0.015 | 0.007 |
| 1997 | 0.02 | 0.011 | 0.007 |
| 1998 | 0.03 | 0.015 | 0.007 |
| 1999 | 0.03 | 0.014 | 0.006 |
| 2000 | 0.03 | 0.014 | 0.006 |
| 2001 | 0.04 | 0.017 | 0.018 |
| 2002 | 0.03 | 0.007 | -- |
| 2003 | 0.03 | 0.014 | 0.006 |
| 2004 | 0.03 | 0.010 | 0.006 |
| 2005 | 0.03 | 0.014 | 0.006 |
| 2006 | 0.03 | 0.014 | 0.013 |
| 2007 | 0.03 | 0.011 | 0.006 |
| 2008 | 0.03 | 0.017 | 0.006 |
| Average | 0.02 | 0.010 | 0.007 |
Other Available Trend and Comparison Data
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