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Monitoring the Future -- Trends in Marijuana Use
HS Senior Class Cohorts of 1995 through 2008



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Marijuana Use Within Cohort -- High School Senior Classes of 1995 through 2008
Lifetime Past Year Past Month

Source: Monitoring the Future, 2009, Tables 5-5a, 5-5b and 5-5c, pp.202-13

Trends in Marijuana Use Within HS Senior Cohorts -- Classes of 1995 through 2008
  Lifetime Past Year Past Month
Class of: 8th Grade 10th Grade 12th Grade 8th Grade 10th Grade 12th Grade 8th Grade 10th Grade 12th Grade
1995 10.2 24.4 41.7 6.2 19.2 34.7 3.2 10.9 21.2
1996 11.2 30.4 44.9 7.2 25.2 35.8 3.7 15.8 21.9
1997 12.6 34.1 49.6 9.2 28.7 38.5 5.1 17.2 23.7
1998 16.7 39.8 49.1 13.0 33.6 37.5 7.8 20.4 22.8
1999 19.9 42.3 49.7 15.8 34.8 37.8 9.1 20.5 23.1
2000 23.1 39.6 48.8 18.3 31.1 36.5 11.3 18.7 21.6
2001 22.6 40.9 49.0 17.7 32.1 37.0 10.2 19.4 22.4
2002 22.2 40.3 47.8 16.9 32.2 36.2 9.7 19.7 21.5
2003 22.0 40.1 46.1 16.5 32.7 34.9 9.7 19.8 21.2
2004 20.3 38.7 45.7 15.6 30.3 34.3 9.1 17.8 19.9
2005 20.4 36.4 44.8 15.4 28.2 33.6 9.2 17.0 19.8
2006 19.2 35.1 42.3 14.6 27.5 31.5 8.3 15.9 18.3
2007 17.5 34.1 41.8 12.8 26.6 31.7 7.5 15.2 18.8
2008 16.3 31.8 42.6 11.8 25.2 32.4 6.4 14.2 19.4

Note: Data has been adjusted chronologically to reflect changes in drug use patterns within each senior class cohort. That is, the 10th grade and 8th grade data are taken from the corresponding 2 years and 4 years prior respectively to the year shown, for each cohort class.


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