New research has revealed that people who quit smoking in middle age have the same risk of developing dementia as those who never smoked, offering strong evidence that it’s never too late to reverse the cognitive harm caused by tobacco.
The study, published in the Journal of the American Medical Association (JAMA), found that quitting smoking not only halves the rate of verbal decline but also slows memory loss by up to 20% compared to those who continue smoking. Researchers analyzed data from over 35,000 participants across two decades, tracking their lifestyle habits, brain function, and long-term health outcomes.
Lead researcher Dr. Maya Tanaka said the findings provide “clear proof” that stopping smoking in one’s 40s or 50s can restore the brain’s resilience. “The earlier you quit, the greater your protection—but even in midlife, the brain shows remarkable recovery potential,” she noted.
Health experts say the study reinforces the need for stronger global anti-smoking campaigns, as dementia remains one of the world’s leading causes of death. The World Health Organization (WHO) estimates that up to 14% of dementia cases could be linked to modifiable lifestyle factors like smoking, diet, and exercise.
