The Relationship Between Adverse Childhood Experience and Heavy Smoking in Emerging Adulthood: The Role of Not in Education, Employment, or Training Status.

Purpose: The purpose of this study was to examine the relationship between adverse childhood experiences (ACEs) in early adolescence and heavy smoking in emerging adulthood, focusing on the mediating role of individuals' not in education, employment, or training (NEET) status.

Methods: Using a retrospective cohort sample from the Taiwan Youth Project, 2,903 participants from the age of 14 years until the age of 22 years were surveyed. Respondents' ACEs were assessed at the age of 14 years, their NEET status was assessed at the age of 20 years, and heavy smoking was measured at the age of 22 years. Regression and mediation analyses with resampling were conducted.

Results: In a separate model, cumulative ACEs, three or more ACEs, and family dysfunction during early adolescence were significantly related and emerging adults' heavy smoking (adjusted odds ratio [AOR] = 1.32; AOR = 2.91; and AOR = 2.31, respectively) and NEET status (AOR = 1.27; AOR = 2.99; and AOR = 2.09, respectively). In the final model (including both ACE and NEET), these three ACE measures were still significantly related to heavy smoking and NEET status was also significantly related to heavy smoking. Finally, bootstrapping results indicated that the indirect effects from ACEs on heavy smoking through NEET were significant, which indicated significant indirect effects.

Conclusions: ACEs have a profound impact on emerging adults' heavy smoking, both directly and indirectly, through their NEET status. Thus, future research should focus on individuals' NEET status and its association with unhealthy behaviors in emerging adulthood.