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AJPH First Look, published online ahead of print Oct 15, 2008
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AJPH.2007.130294v1
98/12/2244    most recent
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December 2008, Vol 98, No. 12 | American Journal of Public Health 2244-2250
© 2008 American Public Health Association
DOI: 10.2105/AJPH.2007.130294

RESEARCH AND PRACTICE

Smoking and Cognitive Decline Among Middle-Aged Men and Women: The Doetinchem Cohort Study

Astrid C. J. Nooyens, MSc, Boukje M. van Gelder, PhD and W. M. Monique Verschuren, PhD

The authors are with the Centre for Prevention and Health Services Research, National Institute for Public Health and the Environment (RIVM), Bilthoven, Netherlands.

Correspondence: Requests for reprints should be sent to W. M. Monique Verschuren, PhD, Centre for Prevention and Health Services Research, National Institute for Public Health and the Environment (RIVM), PO Box 1, Postbak 101, 3720 BA Bilthoven, The Netherlands (e-mail: wmm.verschuren{at}rivm.nl).

Objectives. We studied the effect of smoking on cognitive decline over a 5-year period at middle age (43 to 70 years).

Methods. In the Doetinchem Cohort Study, 1964 men and women in the Netherlands were examined for cognitive function at baseline and 5 years later. The association between smoking status and memory function, speed of cognitive processes, cognitive flexibility, and global cognitive function were assessed.

Results. At baseline, smokers scored lower than never smokers in global cognitive function, speed, and flexibility. At 5-year follow-up, decline among smokers was 1.9 times greater for memory function, 2.4 times greater for cognitive flexibility, and 1.7 times greater for global cognitive function than among never smokers. Among ever smokers, the declines in all cognitive domains were larger with increasing number of pack-years smoked.

Conclusions. Interventions to prevent or stop people from smoking may postpone cognitive decline in middle-aged persons.




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