Objective: Addiction is one of the most important social problems in society that is associated with several issues in medical, psychiatric, family, employment, legal, financial and spiritual areas. Therefore, in recent years, numerous studies have been conducted to investigate the causes of addiction relapse in treated addicts and researchers have also tried to determine the amount and importance of the role of each personal and environmental factor effective in this disorder. As a

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... s, this study aims to integrate different studies and investigate the impact of personal and environmental factors on the addiction relapse into treated patients. Method: This study is a meta-analysis which uses Hunter and Schmidt's approach. For this purpose, 28 out of 42 studies enjoying acceptable methodologies were selected, upon which the meta-analysis was conducted. A meta-analysis checklist constituted the research instrument. Using summary of the study results, the researcher manually calculated effect sizes and interpreted them based on the meta-analysis approach and Cohen's table. Results: After data collection, the results revealed that the effect size of environmental factors on addiction relapse was .64 (p≤0.00001) while it was obtained equal to .41 (p≤0.001) for personal factors on addiction relapse. Conclusion: According to Cohen's table, these effect sizes are evaluated as high and moderate for environmental factors and personal factors on addiction relapse, respectively.