Key Takeaways & Executive Findings
- •• Genetically predicted higher educational attainment is causally associated with lower risk of alcohol dependence, cannabis use disorder, and opioid use disorder. • The protective effect of education on substance use disorders is robust across multiple Mendelian randomization sensitivity analyses. • No significant causal association was found between educational attainment and other substance use disorders, suggesting specificity. • Improving educational attainment could be an effective public health strategy to reduce the burden of substance use disorders.
Abstract
Substance use disorders (SUDs) impose a substantial global health burden, and educational attainment (EA) has been inversely associated with SUD risk in observational studies. However, the causal nature of this association remains unclear due to potential confounding and reverse causation. We conducted a two-sample Mendelian randomization (MR) study to investigate the causal effect of EA on the risk of alcohol dependence, cannabis use disorder, opioid use disorder, and other substance use disorders. Genetic instruments for EA were derived from a large genome-wide association study (GWAS) of 1.1 million individuals, and summary statistics for SUDs were obtained from the Psychiatric Genomics Consortium and other large-scale GWAS. The primary analysis used the inverse-variance weighted (IVW) method, with sensitivity analyses including weighted median, MR-Egger, and MR-PRESSO to assess pleiotropy and robustness. Genetically predicted higher EA was significantly associated with reduced risk of alcohol dependence (OR = 0.58, 95% CI: 0.49-0.69, P = 1.2×10⁻¹⁰), cannabis use disorder (OR = 0.64, 95% CI: 0.53-0.77, P = 3.4×10⁻⁶), and opioid use disorder (OR = 0.72, 95% CI: 0.58-0.89, P = 0.002). No significant association was found for other SUDs. Sensitivity analyses yielded consistent estimates, and no evidence of horizontal pleiotropy was detected. Our findings support a causal protective effect of higher educational attainment on the risk of alcohol, cannabis, and opioid use disorders. Policies aimed at improving educational outcomes may contribute to reducing the burden of substance use disorders.
1. Introduction
Substance use disorders (SUDs) are chronic relapsing conditions characterized by compulsive drug seeking and use despite adverse consequences. They impose a significant burden on individuals, families, and society, with substantial morbidity and mortality worldwide. Educational attainment (EA), a key social determinant of health, has been consistently associated with a lower risk of SUDs in observational studies. However, observational findings are susceptible to confounding and reverse causation, making it difficult to establish causality.
Mendelian randomization (MR) provides a powerful approach to infer causality by using genetic variants as instrumental variables, which are randomly allocated at conception and thus less prone to confounding. In this study, we performed a two-sample MR analysis to evaluate the causal effect of EA on the risk of alcohol, cannabis, opioid, and other substance use disorders, using summary statistics from large-scale genome-wide association studies.
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ZHANG Wei, LI Ming, WANG Fang, ... (2026). Causal Association of Educational Attainment with Substance Use Disorders: A Mendelian Randomization Study. Chinese Journal of New Drugs. https://doi.org/pub_80__articleID_435
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Frequently Asked Questions
What is the main finding of this study?
The study found that genetically predicted higher educational attainment is causally associated with a lower risk of alcohol dependence, cannabis use disorder, and opioid use disorder, but not with other substance use disorders.
How was the causal relationship assessed?
We used two-sample Mendelian randomization with genetic variants as instrumental variables, employing inverse-variance weighted method as primary analysis and several sensitivity analyses to test robustness.
What are the implications of this research?
The findings suggest that policies aimed at improving educational outcomes could help reduce the burden of substance use disorders, particularly for alcohol, cannabis, and opioids.
What are the limitations of the study?
The study relies on genetic instruments that may not fully capture the complex effects of education, and the sample populations were primarily of European ancestry, which may limit generalizability.
Where was this research published?
The research was published in a peer-reviewed journal, and the full details are available in the paper.
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