May 21, 2026, 12:01 pm | Read time: 4 minutes
A successful smoking cessation not only has numerous well-known health benefits but also appears to positively influence the risk of dementia. However, researchers involved in the current study discovered a crucial catch. FITBOOK explains what those wanting to quit should pay attention to and whether vaping is the “healthier” alternative in this regard.
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 (FITBOOK reported). 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 A successful smoking cessation 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 thinking tests provided insight into whether dementia had developed in the meantime. After a study period of 25 years, the researchers evaluated all the data to get a clearer picture of the impact of smoking cessation on dementia risk.
How much the risk of dementia decreases with smoking cessation
The positive effects on the brain seemed to diminish with every extra pound that tobacco abstinence often brings at the beginning. These effects were noticeable with just 11 pounds more. At 22 pounds, smoking cessation 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, giving up tobacco almost inevitably increases appetite (FITBOOK reported). However, with the help of nutritional counseling and a practical exercise plan, this can be well managed.
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Why ex-smokers should not gain more than 11 pounds
The positive effects on the brain seemed to diminish with every extra pound that cigarette tobacco often brings at the beginning. These effects were noticeable with just 11 pounds more. At 22 pounds, smoking cessation 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, giving up tobacco almost inevitably increases appetite (FITBOOK reported). However, with the help of nutritional counseling and a practical exercise plan, this can be well managed.
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Quitting smoking is good for the brain, but …
As a classic observational study, the investigation does not provide concrete evidence that smoking cessation alone is responsible for the reduced risk of dementia. 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 giving up 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.
Switching to vaping as “dementia prevention”? The study leader’s advice
Researchers suspect that the dementia-promoting properties are primarily due to tobacco. As the switch to tobacco-free vapes becomes increasingly popular, not least because of their less intrusive smell, the question arises: Could the switch have a similar effect on dementia risk as quitting smoking? “There is no evidence or indication for this,” warns study leader Dr. Hui to FITBOOK. “Even the addictive nicotine poses health risks and significantly affects brain chemistry.” From a scientific perspective, the only reliable advice is: “Stop everything related to smoking, vaping, or similar activities.” This also means using nicotine replacement products only as long as necessary.