May 21, 2026, 12:01 pm | Read time: 3 minutes
Successfully quitting smoking not only has numerous well-known health benefits but also appears to positively impact the risk of dementia. However, researchers involved in the current study discovered a crucial catch. FITBOOK explains what those wanting to quit should definitely pay attention to.
Tobacco and the substances released and inhaled during smoking are neurotoxins. Previous studies have already demonstrated the negative effects of cigarette consumption on cognitive performance. Many smokers over 60 still believe that quitting smoking at their age is no longer worthwhile. Wrong! A recent analysis published in the journal ‘Neurology’ shows the opposite.1 Successfully quitting smoking is always associated with a significantly reduced risk of dementia. This risk approaches that of non-smokers after just seven years of abstinence. However, for the brain to fully benefit from a tobacco-free life, one condition must be met.
Long-Term Study With Nearly 33,000 Healthy Older Adults
For their study, the researchers recruited 32,802 dementia-free women and men. Their average age at the start was about 60 years. Twenty percent of them were smokers, 36 percent were ex-smokers, and 43 percent had never smoked. Every two years, participants were surveyed about their smoking status, body weight, and general health. Additional memory and cognitive tests provided insight into whether dementia had developed in the meantime. After a study period of 25 years, the researchers analyzed all the data to get a clearer picture of the impact of quitting smoking on dementia risk.
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How Much Quitting Smoking Reduces Dementia Risk
The positive effects on the brain seemed to diminish with each extra pound often gained at the start of tobacco abstinence. These effects became noticeable with just 11 pounds more. At 22 pounds, quitting smoking no longer had any apparent positive impact on dementia risk. The researchers conclude that the immediate period after the last cigarette is particularly crucial. Indeed, quitting tobacco almost inevitably increases appetite (FITBOOK reported). However, with the help of nutritional counseling and a practical exercise plan, this can be well managed.
Quitting Smoking Is Good for the Brain, but …
As a classic observational study, the research does not provide concrete evidence that quitting smoking alone is responsible for the reduced dementia risk. Additionally, most of the data is based on self-reports from participants. Memory errors and other biases are unavoidable. Although the results should therefore be interpreted with caution, the study suggests a link between quitting tobacco and brain health that seems to hold even in older age. And on one point, all serious smoking studies agree: Continuing to smoke offers no benefits.