Evening types are more often current smokers and nicotine-dependent—a study of Finnish adult twins
Version of Record online: 30 SEP 2010
© 2010 The Authors, Addiction © 2010 Society for the Study of Addiction
Volume 106, Issue 1, pages 170–177, January 2011
How to Cite
Broms, U., Kaprio, J., Hublin, C., Partinen, M., Madden, P.A.F. and Koskenvuo, M. (2011), Evening types are more often current smokers and nicotine-dependent—a study of Finnish adult twins. Addiction, 106: 170–177. doi: 10.1111/j.1360-0443.2010.03112.x
- Issue online: 10 DEC 2010
- Version of Record online: 30 SEP 2010
- Submitted 7 February 2010; initial review completed 2 March 2010; final version accepted 21 June 2010
- current smoking;
- diurnal type;
- DSM-IV nicotine dependence;
- Fagerström Test for Nicotine Dependence
Aims To examine the association between diurnal type and smoking status and nicotine dependence (ND).
Design A cohort study using random-effects model regressions for repeated longitudinal panel data was used to analyse smoking status by diurnal type. Regression analyses examined the association between diurnal type and ND.
Participants A total of 23 289 same-sex adult twin individuals from Finnish Twin Cohort. Nicotine dependence was studied in a subsample of 676 twin individuals.
Measurements Subjects were classified by self-report into four categories: morning type, somewhat morning type, somewhat evening type, evening type (in 1981). Smoking status was defined as current and ever smoking (in 1975, 1981 and 1990). ND was measured by DSM-IV and Fagerström Test for Nicotine Dependence (FTND) (during 2001–05).
Findings Evening types of both genders were much more likely to be current (OR = 2.91, 95% CI 2.50, 3.38) and life-time smokers (OR = 2.67, 95% CI 2.96, 4.07) compared to morning types. Evening types were less likely to stop smoking. The risk of nicotine dependence assessed by DSM-IV criteria was higher among evening types (OR = 2.78, 95% CI 1.64, 4.72). Evening types scored 0.59 (95% CI 0.01, 1.17) points higher than morning types on the FTND. Adjustment for potential confounders did not change these associations.
Conclusions Being an evening type is associated independently with a higher risk of being a current smoker, being more highly dependent upon cigarettes and a lower likelihood of stopping smoking. Understanding the cause of these associations could elucidate the causes of tobacco addiction.