Monitoring the Future -- Trends in Past Month Marijuana Use
vs Alcohol Use by Young Adults (1986 - 2008)

Source: Monitoring the Future, Vols I & II (2009)

Ratios of Marijuana Use to Alcohol Use Among Young Adults -- Past Month Use (1986 - 2008)
Year	Ages 19 Use to 28	College Students	12th Grade Students
1986	0.29	0.28	0.36
1987	0.27	0.26	0.32
1988	0.24	0.22	0.28
1989	0.21	0.21	0.28
1990	0.20	0.19	0.25
1991	0.19	0.19	0.26
1992	0.19	0.20	0.23
1993	0.20	0.20	0.32
1994	0.21	0.22	0.38
1995	0.21	0.28	0.41
1996	0.23	0.26	0.43
1997	0.22	0.27	0.45
1998	0.22	0.27	0.44
1999	0.23	0.30	0.45
2000	0.24	0.30	0.43
2001	0.25	0.30	0.45
2002	0.25	0.29	0.44
2003	0.26	0.29	0.45
2004	0.24	0.28	0.41
2005	0.25	0.30	0.45
2006	0.25	0.29	0.44
2007	0.26	0.29	0.45
2008	0.24	0.28	0.41

Other Available Trend and Comparison Data
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