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. Author manuscript; available in PMC: 2021 Oct 1.
Published in final edited form as: Prev Sci. 2020 Oct;21(7):960–971. doi: 10.1007/s11121-020-01150-2

Table 2.

Order of cigarette and marijuana initiation among U.S. 12th grade students, 2000–2019

Any cigarette initiation % (SE) Any marijuana initiation % (SE) Neither % (SE) Cigarettes only % (SE) Marijuana only % (SE) Cigarettes first % (SE) Same grade % (SE) Marijuana first % (SE)
Among all respondents
Years combined 36.3 (0.49) 40.3 (0.38) 50.8 (0.41) 8.9 (0.20) 13.0 (0.28) 14.4 (0.28) 8.3 (0.16) 4.7 (0.12)
By year
 2000 56.0 (1.52) 44.1 (1.41) 38.6 (1.46) 17.3 (0.99) 5.5 (0.49) 27.1 (1.21) 8.9 (0.65) 2.7 (0.34)
 2001 55.1 (1.49) 45.7 (1.40) 38.3 (1.39) 15.9 (1.03) 6.5 (0.61) 27.4 (1.11) 9.2 (0.70) 2.6 (0.35)
 2002 50.2 (1.50) 43.3 (1.39) 42.5 (1.42) 14.2 (0.92) 7.3 (0.75) 23.9 (1.04) 9.1 (0.64) 3.0 (0.36)
 2003 48.2 (1.34) 42.1 (1.31) 44.4 (1.25) 13.5 (0.85) 7.4 (0.56) 21.8 (0.92) 9.2 (0.57) 3.7 (0.39)
 2004 46.6 (1.30) 40.6 (1.28) 45.8 (1.25) 13.6 (0.88) 7.6 (0.61) 19.5 (0.88) 8.9 (0.57) 4.6 (0.40)
 2005 43.8 (1.34) 40.6 (1.49) 47.8 (1.35) 11.6 (0.76) 8.4 (0.61) 17.9 (1.02) 10.0 (0.58) 4.3 (0.41)
 2006 41.7 (1.42) 39.4 (1.52) 49.6 (1.54) 11.0 (0.85) 8.7 (0.68) 15.8 (0.84) 9.3 (0.59) 5.6 (0.59)
 2007 39.3 (1.50) 37.8 (1.52) 52.1 (1.60) 10.1 (0.68) 8.7 (0.63) 15.2 (0.84) 9.7 (0.65) 4.3 (0.42)
 2008 38.1 (1.33) 37.3 (1.34) 53.0 (1.44) 9.7 (0.64) 8.9 (0.62) 14.4 (0.77) 9.2 (0.63) 4.8 (0.41)
 2009 36.8 (1.49) 38.1 (1.32) 52.3 (1.45) 9.5 (0.77) 10.8 (0.82) 13.5 (0.78) 9.1 (0.57) 4.7 (0.43)
 2010 34.6 (1.41) 38.1 (1.56) 53.8 (1.62) 8.1 (0.69) 11.6(0.80) 11.7 (0.68) 9.7 (0.61) 5.1 (0.52)
 2011 34.1 (1.37) 41.4 (1.32) 52.2 (1.33) 6.4 (0.53) 13.7 (0.86) 12.5 (0.82) 9.6 (0.54) 5.5 (0.53)
 2012 33.8 (1.50) 42.0 (1.52) 51.3 (1.50) 6.7 (0.57) 14.9 (0.98) 12.1 (0.77) 9.1 (0.63) 5.8 (0.51)
 2013 31.6 (1.38) 41.5 (1.45) 52.1 (1.48) 6.4 (0.64) 16.3 (0.96) 10.8 (0.71) 8.5 (0.65) 6.0 (0.47)
 2014 29.5 (1.23) 40.0 (1.19) 54.5 (1.23) 5.5 (0.52) 16.0 (0.91) 9.7 (0.76) 8.4 (0.60) 5.9 (0.53)
 2015 24.1 (1.13) 40.0 (1.50) 56.1 (1.47) 3.9 (0.44) 19.8(1.28) 8.7 (0.62) 5.9 (0.51) 5.6 (0.48)
 2016 23.7 (1.23) 40.3 (1.33) 55.3 (1.25) 4.3 (0.48) 21.0(1.16) 8.5 (0.76) 5.6 (0.57) 5.2 (0.55)
 2017 21.2 (1.19) 40.8 (1.49) 56.0 (1.44) 3.2 (0.40) 22.8 (1.35) 6.3 (0.58) 6.0 (0.60) 5.6 (0.47)
 2018 16.2 (1.12) 36.8 (1.35) 60.2 (1.36) 3.0 (0.33) 23.6 (0.94) 4.9 (0.53) 4.4 (0.48) 3.9 (0.52)
 2019 18.2 (1.28) 37.3 (1.33) 59.2 (1.43) 3.5 (0.52) 22.7 (1.20) 5.6 (0.67) 4.8 (0.50) 4.2 (0.42)
p (linear, quadratic)a <0.001, 0.060 0.002, 0.044 <0.001, <0.001 <0.001, 0.049 <0.001, 0.228 <0.001, 0.726 <0.001, <0.001 <0.001, <0.001
Among respondents who had initiated both cigarettes and marijuana
Years combined 52.6 (0.57) 30.3 (0.41) 17.1 (0.42)
By year
 2000 70.1 (1.71) 23.1 (1.54) 6.9 (0.84)
 2001 70.0 (1.76) 23.4 (1.61) 6.6 (0.82)
 2002 66.5 (1.51) 25.2 (1.45) 8.4 (1.02)
 2003 62.9 (1.60) 26.5 (1.33) 10.6 (1.03)
 2004 59.0 (1.72) 27.1 (1.42) 13.9 (1.10)
 2005 55.6 (1.60) 31.0 (1.61) 13.4 (1.13)
 2006 51.4 (1.76) 30.2 (1.63) 18.4 (1.61)
 2007 52.0 (1.84) 33.3 (1.55) 14.7 (1.26)
 2008 50.7 (1.92) 32.4 (1.64) 16.9 (1.30)
 2009 49.5 (1.76) 33.3 (1.54) 17.2 (1.49)
 2010 44.0 (1.65) 36.5 (1.66) 19.4 (1.60)
 2011 45.2 (1.96) 34.9 (1.54) 19.9 (1.71)
 2012 44.8 (1.92) 33.7 (1.47) 21.6 (1.59)
 2013 42.8 (2.11) 33.6 (1.95) 23.7 (1.77)
 2014 40.6 (2.55) 34.9 (1.87) 24.5 (2.13)
 2015 43.3 (2.09) 29.0 (2.03) 27.7 (2.13)
 2016 44.1 (2.60) 29.1 (2.27) 26.8 (2.68)
 2017 35.2 (2.44) 33.5 (2.36) 31.3 (2.18)
 2018 37.0 (3.05) 33.5 (2.65) 29.5 (2.97)
 2019 38.2 (3.34) 32.7 (2.64) 29.0 (2.58)
p (linear, quadratic)a <0.001, <0.001 <0.001, <0.001 <0.001, 0.001

Notes: n indicates unweighted number of cases

(unweighted) = 78,252, all 12th grade respondents; 21,406 among cigarette and marijuana initiates

a

p values obtained from bivariate logistic regression models using both centered linear and quadratic terms