Association of state recreational marijuana laws with adolescent marijuana use

Magdalena Cerda, Melanie Wall, Tianshu Feng, Katherine M. Keyes, Aaron Sarvet, John Schulenberg, Patrick M. O'Malley, Rosalie Liccardo Pacula, Sandro Galea, Deborah S. Hasin

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

IMPORTANCE Historical shifts are occurring in marijuana policy. The effect of legalizing marijuana for recreational use on rates of adolescent marijuana use is a topic of considerable debate. OBJECTIVE To examine the association between the legalization of recreational marijuana use inWashington and Colorado in 2012 and the subsequent perceived harmfulness and use of marijuana by adolescents. DESIGN, SETTING, AND PARTICIPANTS We used data of 253 902 students in eighth, 10th, and 12th grades from 2010 to 2015 from Monitoring the Future, a national, annual, cross-sectional survey of students in secondary schools in the contiguous United States. Difference-indifference estimates compared changes in perceived harmfulness of marijuana use and in past-month marijuana use inWashington and Colorado prior to recreational marijuana legalization (2010-2012) with postlegalization (2013-2015) vs the contemporaneous trends in other states that did not legalize recreational marijuana use in this period. MAIN OUTCOMES AND MEASURES Perceived harmfulness of marijuana use (great or moderate risk to health from smoking marijuana occasionally) and marijuana use (past 30 days). RESULTS Of the 253 902 participants, 120 590 of 245 065(49.2%) were male, and the mean (SD) age was 15.6 (1.7) years. InWashington, perceived harmfulness declined 14.2%and 16.1% among eighth and 10th graders, respectively, while marijuana use increased 2.0% and 4.1% from 2010-2012 to 2013-2015. In contrast, among states that did not legalize recreational marijuana use, perceived harmfulness decreased by 4.9% and 7.2%among eighth and 10th graders, respectively, and marijuana use decreased by 1.3%and 0.9%over the same period. Difference-in-difference estimates comparingWashington vs states that did not legalize recreational drug use indicated that these differences were significant for perceived harmfulness (eighth graders:%[SD], -9.3 [3.5]; P = .01; 10th graders:%[SD], -9.0 [3.8]; P = .02) and marijuana use (eighth graders:%[SD], 5.0 [1.9]; P = .03; 10th graders:%[SD], 3.2 [1.5]; P = .007). No significant differences were found in perceived harmfulness or marijuana use among 12th graders inWashington or for any of the 3 grades in Colorado. CONCLUSIONS AND RELEVANCE Among eighth and 10th graders inWashington, perceived harmfulness of marijuana use decreased and marijuana use increased following legalization of recreational marijuana use. In contrast, Colorado did not exhibit any differential change in perceived harmfulness or past-month adolescent marijuana use following legalization. A cautious interpretation of the findings suggests investment in evidence-based adolescent substance use prevention programs in any additional states that may legalize recreational marijuana use.

Original languageEnglish (US)
Pages (from-to)142-149
Number of pages8
JournalJAMA Pediatrics
Volume171
Issue number2
DOIs
StatePublished - Feb 1 2017

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Cannabis
Marijuana Smoking
Students

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

Cite this

Cerda, M., Wall, M., Feng, T., Keyes, K. M., Sarvet, A., Schulenberg, J., ... Hasin, D. S. (2017). Association of state recreational marijuana laws with adolescent marijuana use. JAMA Pediatrics, 171(2), 142-149. https://doi.org/10.1001/jamapediatrics.2016.3624

Association of state recreational marijuana laws with adolescent marijuana use. / Cerda, Magdalena; Wall, Melanie; Feng, Tianshu; Keyes, Katherine M.; Sarvet, Aaron; Schulenberg, John; O'Malley, Patrick M.; Pacula, Rosalie Liccardo; Galea, Sandro; Hasin, Deborah S.

In: JAMA Pediatrics, Vol. 171, No. 2, 01.02.2017, p. 142-149.

Research output: Contribution to journalArticle

Cerda, M, Wall, M, Feng, T, Keyes, KM, Sarvet, A, Schulenberg, J, O'Malley, PM, Pacula, RL, Galea, S & Hasin, DS 2017, 'Association of state recreational marijuana laws with adolescent marijuana use', JAMA Pediatrics, vol. 171, no. 2, pp. 142-149. https://doi.org/10.1001/jamapediatrics.2016.3624
Cerda, Magdalena ; Wall, Melanie ; Feng, Tianshu ; Keyes, Katherine M. ; Sarvet, Aaron ; Schulenberg, John ; O'Malley, Patrick M. ; Pacula, Rosalie Liccardo ; Galea, Sandro ; Hasin, Deborah S. / Association of state recreational marijuana laws with adolescent marijuana use. In: JAMA Pediatrics. 2017 ; Vol. 171, No. 2. pp. 142-149.
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abstract = "IMPORTANCE Historical shifts are occurring in marijuana policy. The effect of legalizing marijuana for recreational use on rates of adolescent marijuana use is a topic of considerable debate. OBJECTIVE To examine the association between the legalization of recreational marijuana use inWashington and Colorado in 2012 and the subsequent perceived harmfulness and use of marijuana by adolescents. DESIGN, SETTING, AND PARTICIPANTS We used data of 253 902 students in eighth, 10th, and 12th grades from 2010 to 2015 from Monitoring the Future, a national, annual, cross-sectional survey of students in secondary schools in the contiguous United States. Difference-indifference estimates compared changes in perceived harmfulness of marijuana use and in past-month marijuana use inWashington and Colorado prior to recreational marijuana legalization (2010-2012) with postlegalization (2013-2015) vs the contemporaneous trends in other states that did not legalize recreational marijuana use in this period. MAIN OUTCOMES AND MEASURES Perceived harmfulness of marijuana use (great or moderate risk to health from smoking marijuana occasionally) and marijuana use (past 30 days). RESULTS Of the 253 902 participants, 120 590 of 245 065(49.2{\%}) were male, and the mean (SD) age was 15.6 (1.7) years. InWashington, perceived harmfulness declined 14.2{\%}and 16.1{\%} among eighth and 10th graders, respectively, while marijuana use increased 2.0{\%} and 4.1{\%} from 2010-2012 to 2013-2015. In contrast, among states that did not legalize recreational marijuana use, perceived harmfulness decreased by 4.9{\%} and 7.2{\%}among eighth and 10th graders, respectively, and marijuana use decreased by 1.3{\%}and 0.9{\%}over the same period. Difference-in-difference estimates comparingWashington vs states that did not legalize recreational drug use indicated that these differences were significant for perceived harmfulness (eighth graders:{\%}[SD], -9.3 [3.5]; P = .01; 10th graders:{\%}[SD], -9.0 [3.8]; P = .02) and marijuana use (eighth graders:{\%}[SD], 5.0 [1.9]; P = .03; 10th graders:{\%}[SD], 3.2 [1.5]; P = .007). No significant differences were found in perceived harmfulness or marijuana use among 12th graders inWashington or for any of the 3 grades in Colorado. CONCLUSIONS AND RELEVANCE Among eighth and 10th graders inWashington, perceived harmfulness of marijuana use decreased and marijuana use increased following legalization of recreational marijuana use. In contrast, Colorado did not exhibit any differential change in perceived harmfulness or past-month adolescent marijuana use following legalization. A cautious interpretation of the findings suggests investment in evidence-based adolescent substance use prevention programs in any additional states that may legalize recreational marijuana use.",
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AU - Keyes, Katherine M.

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AU - Schulenberg, John

AU - O'Malley, Patrick M.

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N2 - IMPORTANCE Historical shifts are occurring in marijuana policy. The effect of legalizing marijuana for recreational use on rates of adolescent marijuana use is a topic of considerable debate. OBJECTIVE To examine the association between the legalization of recreational marijuana use inWashington and Colorado in 2012 and the subsequent perceived harmfulness and use of marijuana by adolescents. DESIGN, SETTING, AND PARTICIPANTS We used data of 253 902 students in eighth, 10th, and 12th grades from 2010 to 2015 from Monitoring the Future, a national, annual, cross-sectional survey of students in secondary schools in the contiguous United States. Difference-indifference estimates compared changes in perceived harmfulness of marijuana use and in past-month marijuana use inWashington and Colorado prior to recreational marijuana legalization (2010-2012) with postlegalization (2013-2015) vs the contemporaneous trends in other states that did not legalize recreational marijuana use in this period. MAIN OUTCOMES AND MEASURES Perceived harmfulness of marijuana use (great or moderate risk to health from smoking marijuana occasionally) and marijuana use (past 30 days). RESULTS Of the 253 902 participants, 120 590 of 245 065(49.2%) were male, and the mean (SD) age was 15.6 (1.7) years. InWashington, perceived harmfulness declined 14.2%and 16.1% among eighth and 10th graders, respectively, while marijuana use increased 2.0% and 4.1% from 2010-2012 to 2013-2015. In contrast, among states that did not legalize recreational marijuana use, perceived harmfulness decreased by 4.9% and 7.2%among eighth and 10th graders, respectively, and marijuana use decreased by 1.3%and 0.9%over the same period. Difference-in-difference estimates comparingWashington vs states that did not legalize recreational drug use indicated that these differences were significant for perceived harmfulness (eighth graders:%[SD], -9.3 [3.5]; P = .01; 10th graders:%[SD], -9.0 [3.8]; P = .02) and marijuana use (eighth graders:%[SD], 5.0 [1.9]; P = .03; 10th graders:%[SD], 3.2 [1.5]; P = .007). No significant differences were found in perceived harmfulness or marijuana use among 12th graders inWashington or for any of the 3 grades in Colorado. CONCLUSIONS AND RELEVANCE Among eighth and 10th graders inWashington, perceived harmfulness of marijuana use decreased and marijuana use increased following legalization of recreational marijuana use. In contrast, Colorado did not exhibit any differential change in perceived harmfulness or past-month adolescent marijuana use following legalization. A cautious interpretation of the findings suggests investment in evidence-based adolescent substance use prevention programs in any additional states that may legalize recreational marijuana use.

AB - IMPORTANCE Historical shifts are occurring in marijuana policy. The effect of legalizing marijuana for recreational use on rates of adolescent marijuana use is a topic of considerable debate. OBJECTIVE To examine the association between the legalization of recreational marijuana use inWashington and Colorado in 2012 and the subsequent perceived harmfulness and use of marijuana by adolescents. DESIGN, SETTING, AND PARTICIPANTS We used data of 253 902 students in eighth, 10th, and 12th grades from 2010 to 2015 from Monitoring the Future, a national, annual, cross-sectional survey of students in secondary schools in the contiguous United States. Difference-indifference estimates compared changes in perceived harmfulness of marijuana use and in past-month marijuana use inWashington and Colorado prior to recreational marijuana legalization (2010-2012) with postlegalization (2013-2015) vs the contemporaneous trends in other states that did not legalize recreational marijuana use in this period. MAIN OUTCOMES AND MEASURES Perceived harmfulness of marijuana use (great or moderate risk to health from smoking marijuana occasionally) and marijuana use (past 30 days). RESULTS Of the 253 902 participants, 120 590 of 245 065(49.2%) were male, and the mean (SD) age was 15.6 (1.7) years. InWashington, perceived harmfulness declined 14.2%and 16.1% among eighth and 10th graders, respectively, while marijuana use increased 2.0% and 4.1% from 2010-2012 to 2013-2015. In contrast, among states that did not legalize recreational marijuana use, perceived harmfulness decreased by 4.9% and 7.2%among eighth and 10th graders, respectively, and marijuana use decreased by 1.3%and 0.9%over the same period. Difference-in-difference estimates comparingWashington vs states that did not legalize recreational drug use indicated that these differences were significant for perceived harmfulness (eighth graders:%[SD], -9.3 [3.5]; P = .01; 10th graders:%[SD], -9.0 [3.8]; P = .02) and marijuana use (eighth graders:%[SD], 5.0 [1.9]; P = .03; 10th graders:%[SD], 3.2 [1.5]; P = .007). No significant differences were found in perceived harmfulness or marijuana use among 12th graders inWashington or for any of the 3 grades in Colorado. CONCLUSIONS AND RELEVANCE Among eighth and 10th graders inWashington, perceived harmfulness of marijuana use decreased and marijuana use increased following legalization of recreational marijuana use. In contrast, Colorado did not exhibit any differential change in perceived harmfulness or past-month adolescent marijuana use following legalization. A cautious interpretation of the findings suggests investment in evidence-based adolescent substance use prevention programs in any additional states that may legalize recreational marijuana use.

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