Aim: This study aimed to examine the relationship between smartphone addiction and life satisfaction, and to identify the sociodemographic and behavioral factors influencing these variables in a sample of adult smartphone users.

Materials and Method: This analytical, cross-sectional study was conducted with volunteer participants aged 18 years and over who applied to our clinic over a 6-month period. Data were obtained via a 36-item questionnaire covering sociodemographic features, smartphone usage habits, internet and social media use, and factors that may influence life satisfaction as well as the 10-item Smartphone Addiction Scale–Short Form (SAS-SF) and 5-item The Satisfaction with Life Scale (SWLS). Statistical analyses were performed using the SPSS version 25.0 software package.

Results: The findings revealed a moderate negative correlation between smartphone addiction and life satisfaction (β=-0.327, p<0.001). Higher addiction scores were observed among younger participants, women, single individuals, those with a psychiatric diagnosis, and those with more frequent smartphone use, higher social media engagement, and more frequent phone replacements. Conversely, life satisfaction scores were higher among older participants, married individuals, and those with less screen exposure. Generation Z participants had higher addiction and lower life satisfaction scores compared to Generations Y and X.

Conclusion: Smartphone addiction is a complex behavioral issue that negatively impacts subjective well-being. The results underscore the importance of considering demographic and risk factors in addressing smartphone dependency. Targeted interventions promoting digital balance, especially among younger and high-risk populations, may enhance life satisfaction and reduce the psychological burden associated with excessive smartphone use.