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A difference-in-difference approach to examining the impact of cannabis legalization on disparities in the use of cigarettes and cannabis in the United States, 2004–17

Addiction Feb 04, 2022

Researchers examined how recreational and medical cannabis laws (RCL, MCL) have affected the use of cannabis and cigarettes in the United States.

  • Data from the 2004–17 National Survey on Drug Use and Health (NSDUH) were retrieved for inclusion in difference-in-difference analyses.

  • Findings revealed a varying impact of recreational and medical cannabis legalization on the use, and co-use, of cannabis and cigarettes in the United States.

  • An increase in cigarette–cannabis co-use was observed overall in correlation with MCL, with the greatest increases among those aged 50 years and above, married, non-Hispanic (NH) black and with a college degree or above.

  • There appeared association of MCL with increases in cigarette-only use among those aged 50 years and above and NH black and increases in cannabis-only use among those aged 50 years and above and widowed/divorced/separated.

  • Among those who were married and aged 50 years and above, association of RCL was observed with a rise in cannabis-only use overall, a reduction in in cigarette-only use overall and increases in co-use.

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