Table 8

Average initiation ages for entry level agents (N = 2498). This table is depicted by Figure 1 and emphasizes the rapid fall in age at initiation of cannabis after it first became available in high schools.

Tobacco

Alcohol

Cannabis

1936–1940

16.07

16.43

26.39

1941–1945

15.86

15.89

21.12

1946–1950

14.98

16.18

18.64

1951–1955

14.88

15.79

16.58

1956–1960

14.8

15.25

15.87

1961–1965

14.74

14.71

15.66

1966–1970

15.28

14.84

14.92

1971–1975

15.08

15.04

15.68

1976–1980

14.99

15.22

15.15

1981–1985

14.29

14.66

14.32

O'Connell and Bou-Matar Harm Reduction Journal 2007 4:16   doi:10.1186/1477-7517-4-16