Effect of harm perception on ENDS initiation among US adolescents and young adults: Longitudinal findings from the population assessment of tobacco and health (PATH) study, 2013-2018.

BACKGROUND

This study investigates how ENDS harm perception influences ENDS initiation over time among US young people.

METHODS

Data were from the sample of the Population Assessment of Tobacco and Health (PATH) Study conducted from 2013 to 2018. The Cox proportional hazards regression models were used to assess the relationship between absolute (the perception of harm from ENDS only) and relative harm perception (ENDS' harm relative to cigarettes) and ENDS initiation among adolescents (12-17 years) and young adults (18-24 years) separately. Harm perception was assessed at the wave before ENDS initiation in a subsequent wave. Weighted results were reported.

RESULTS

Of the 11,633 adolescents and 5089 young adults from baseline, 17.1% and 25.5% initiated ENDS use across four waves, respectively. Among adolescents (HR=2.31; 95%CI: 1.95-2.73) and young adults (HR=1.97; 95%CI: 1.69-2.30), perceiving lower relative harm of ENDS significantly predicted ENDS initiation in subsequent waves. Among adolescents, perceiving lower absolute harm of ENDS (HR=2.18; 95%CI: 1.83-2.60) predicted ENDS initiation in subsequent waves. Additionally, adolescents and young adults who ever used any other tobacco products or alcohol and lived with anyone who used tobacco were more likely to initiate ENDS use.

CONCLUSIONS

Among a representative longitudinal cohort of adolescents and young adults who had never used ENDS at baseline, perceiving ENDS as reduced or low-harm products significantly predicted ENDS initiation in subsequent waves. These findings underscore the importance of ENDS harm perception and the central role of risk communication strategies that need to target those young people at particular risk of unwarranted ENDS use.