Source: Monitoring the Future
| Ratios of Inhalant to Marijuana Use -- Lifetime Use (1991 - 2005) | |||
|---|---|---|---|
| Year | 12th Grade | 10th Grade | 8th Grade |
| 1991 | 0.48 | 0.67 | 1.73 |
| 1992 | 0.51 | 0.78 | 1.55 |
| 1993 | 0.49 | 0.72 | 1.54 |
| 1994 | 0.46 | 0.59 | 1.19 |
| 1995 | 0.42 | 0.56 | 1.09 |
| 1996 | 0.37 | 0.48 | 0.92 |
| 1997 | 0.32 | 0.43 | 0.93 |
| 1998 | 0.31 | 0.46 | 0.92 |
| 1999 | 0.31 | 0.42 | 0.90 |
| 2000 | 0.29 | 0.41 | 0.88 |
| 2001 | 0.27 | 0.38 | 0.84 |
| 2002 | 0.24 | 0.35 | 0.79 |
| 2003 | 0.24 | 0.35 | 0.90 |
| 2004 | 0.24 | 0.35 | 1.06 |
| 2005 | 0.25 | 0.38 | 1.04 |
| Averages: | 0.35 | 0.50 | 1.09 |
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