Substance Use and Suicide Attempts in Adolescents: A Comparative Analysis of Clinical and Psychosocial Risk Factors

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Background/Objectives: This study aimed to compare clinical and psychosocial characteristics of substance-using adolescents in Türkiye with and without a history of suicide attempts to identify distinguishing risk factors. Methods: A retrospective analysis was conducted using medical records from 140 adolescents (aged 13–18) treated at a specialized Child and Adolescent Substance Use Center in Türkiye between March 2023 and February 2025. Sociodemographic, clinical, and substance use data were collected. Group comparisons were performed using chi-square and t-tests. Logistic regression was used to identify predictors of suicide attempt history. Results: Among the sample, 52 adolescents (37.1%) had a history of suicide attempts. Compared to their counterparts, the substance-using adolescents were more likely to be female (73.1%) and have histories of psychiatric hospitalization, institutional care, criminal behavior, and polysubstance use (p < 0.05). High-frequency use (≥3 days/week) of methamphetamine, stimulants, cannabinoids, and alcohol was significantly more common in this group (all p < 0.01). The Addiction Profile Index–Adolescent form (API-A) scores indicated more severe addiction profiles. Using cross-validated LASSO and confirmatory logistic regression, female gender emerged as the only robust independent predictor of suicide attempt history (OR = 6.84). Conclusions: Adolescents with a history of suicide attempts exhibit more severe substance use, particularly involving cannabinoids, and greater psychosocial adversity. This distinct risk profile underscores the need for early, gender-sensitive, and multidimensional interventions.