Effect of Electronic Cigarettes on the Change of Fagerstrom Test for Nicotine Dependence Scores during 1-Year Follow-up

Abstract

Background: The use of e-cigarettes is increasing globally, particularly among young adults. Although several use them to quit smoking, their effects are controversial. The Fagerstrom Test for Nicotine Dependence (FTND) was used to assess nicotine dependence in the smoking cessation process. This study examined changes in FTND scores among young adults using different types of cigarettes over a 1-year period. Methods: Prospective cohort data were collected from cigarette users at higher education institutions in the lower northern region of Thailand to analyze changes in FTND scores over a 1-year period. E-cigarette users and combined users were compared with conventional cigarette users. A marginal structural model (MSM) with an inverse probability of weighting (IPW) was used to adjust for time-dependent and time-independent confounders. Results: Of the 133 participants, 58 were e-cigarette users (43.6%), 33 were combined cigarette users (24.8%), and 42 were conventional cigarette users (31.6%). The results revealed that when both time-dependent and time-independent confounders were adjusted using MSM with IPW, e-cigarette users had a 0.20 decrease in the mean FTND score, and combined users had a 0.47 decrease in the mean FTND score compared to conventional cigarette users. However, the difference was not statistically significant. Conclusion: The use of e-cigarettes or combined cigarettes did not significantly affect nicotine dependence levels in young adults over a 1-year period. Consequently, e-cigarettes should not be recommended to reduce nicotine dependence among young adult cigarette users. Further studies are required to determine whether e-cigarettes affect smoking cessation rates.