Identity in the context of physical activity and smoking: A scoping review among adults aged 45+

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Abstract Background Identity (i.e., self-perceptions of oneself) plays an important role in health behaviors such as physical activity (PA) and smoking. This review offers a comprehensive synthesis and comparison of how PA- and smoking-related identity is associated with PA and smoking behavior in adults aged 45+. It further synthesizes and compares identity terminology and measurement tools used to capture identity concerning smoking cessation and PA among adults aged 45+. Where applicable, the role of personal, PA-, and smoking-related characteristics were considered. Methods A thorough search across 11 databases, updated in May 2023, yielded 5801 unique publications. Ensuing careful screening procedures, 45 peer-reviewed empirical studies were systematically reviewed. Experts in the field contributed to validate and structure the narrative. Results The review reveals a complex, enduring connection between identity and behavior in both PA and smoking domains, encompassing processes like identity formation, maintenance, change, and loss. In essence, identities linked to PA and abstaining from smoking emerged as pivotal for promoting active lifestyles and successful smoking cessation. Many parallels but also distinctions emerged within this association, alongside variations in the terminology and measurement tools pertaining to identity. Factors such as gender, age, and behavioral history emerged as influential in shaping identities related to smoking and PA. Conclusions Despite variances, findings suggest that the relationship between identity and behavior, including associated processes, may not fundamentally differ between health-promoting and health-compromising behaviors. There is however need for more unified identity definitions and measurement tools. We propose avenues for future research, including exploring causality between identity and behavior to facilitate the development of identity-related smoking cessation and PA-promotion interventions. Key messages • Identities associated with physical activity and refraining from smoking are associated with a physically active lifestyle and successful smoking cessation. • Despite differences, the relationship between identity and behavior may not fundamentally vary between health-promoting and health-compromising behaviors.