Quitting smoking not reduction may lower risk of dementia: JAMA

The study summary includes the following:

• The data was used from the National Health Insurance Service database of Korea.
• The participants were 40 or older and underwent biennial health examinations (2009 and 2011).
• The study participants had current smoking status at the first health examination.
• There were 789 532 participants, with 95.8% male and of mean age of 52.2 years.
• The median follow-up period of 6.3 years.
• Total 11 912 dementia events occurred, including 8800 events of Alzheimer's disease (AD) and 1889 events of Vascular Dementia.
• In the quitter group, there was a lower risk of all dementia with an adjusted hazard ratio of 0.92 than in the sustainer group.
• The participants in the reducer I had aHR of 1.25, and increaser with aHR of 1.12 had a higher risk of all dementia than those in the sustainer group.
• The patterns for AD and VaD remained consistent with patterns for all dementia.

In this study, the primary outcome was newly diagnosed dementia identified by prescription antidementia medications with concomitant International Statistical Classification of Diseases and Related Health Problems, Tenth Revision diagnosis codes for dementia.

The researchers highlighted that smoking cessation could reduce the disease burden of dementia.

Further reading:

Jeong S, Park J, Han K, et al. Association of Changes in Smoking Intensity With Risk of Dementia in Korea. JAMA Netw Open. 2023;6(1):e2251506. doi:10.1001/jamanetworkopen.2022.51506