Smoking and Dementia
Smoking raises the risk of dementia, and quitting at any age helps; learn what research shows about smoking, quitting and the brain, plus free tools to help you stop.
Last reviewed: October 2026
Most people know smoking harms the lungs and heart. Fewer know it's also bad for the brain. Smoking is one of the 14 modifiable risk factors for dementia identified by the 2024 Lancet Commission, and quitting is one of the clearest steps anyone can take to protect their brain.
How smoking affects the brain
Smoking damages the brain in several ways:
- Blood vessels. Smoking narrows and damages arteries, cutting blood flow to the brain and raising the risk of stroke and vascular dementia (see Vascular Dementia).
- Oxidative stress and inflammation. Toxins in tobacco smoke can harm brain cells.
- Heart and lung disease, which reduce the oxygen reaching the brain.
A 2014 knowledge summary by the World Health Organization (WHO) and Alzheimer's Disease International brought together the evidence linking tobacco use, including smoked and smokeless tobacco and second-hand smoke exposure, with dementia, and called on brain health specialists to join the fight against tobacco. Its message was simple: tobacco use raises dementia risk, and cutting it could reduce the number of people who develop dementia.
How big is the risk?
The 2024 Lancet Commission estimated that smoking accounts for about 2% of dementia cases worldwide. That may sound small, but it represents a very large number of people, and it's entirely preventable. Because smoking also drives high blood pressure, heart disease and stroke, its overall effect on brain health is likely larger.
Quitting helps, even later in life
You might think: "I've smoked for 40 years. What's the point now?" The research is encouraging.
A Korean study followed more than 46,000 men aged 60 and older for eight years. Compared with men who kept smoking:
- Men who had quit for four years or more had about a 14% lower risk of dementia overall.
- Long-term quitters had about a 32% lower risk of vascular dementia.
- Men who had never smoked had about a 19% lower risk overall, so long-term quitters had closed most of the gap.
The Lancet Commission likewise notes that stopping smoking reduces dementia risk, even in later life.
Quitting also brings quick benefits for blood pressure, circulation, breathing, and the risk of heart attack and stroke.
What about vaping and other tobacco?
E-cigarettes are newer, and their long-term effects on the brain aren't well known. Most contain nicotine, which is addictive. Smokeless tobacco and cigars carry their own health risks. If you use e-cigarettes to quit smoking, aim to eventually stop those too, and talk with your doctor about the best plan for you.
Free help to quit
Quitting is hard; most people try several times before it sticks. Support and quit-smoking medicines make success much more likely. Free options include:
- 1-800-QUIT-NOW (1-800-784-8669): free coaching from your state's quitline
- Smokefree.gov: free text programs, apps and quit plans, including Smokefree 60+ for older adults
- Your doctor or pharmacist: medicines such as nicotine patches, gum or lozenges, and prescription options can help. Many are covered by Medicare and other insurance.
- Veterans can get help through the VA (see Resources for Veterans)
Tips for quitting
- Pick a quit date within the next two weeks and tell family and friends.
- Know your triggers: morning coffee, after meals, stress, driving. Plan something else for those moments.
- Remove cigarettes, lighters and ashtrays from home, car and work.
- Use medicine and coaching together, which works better than either alone.
- Move more. A short walk can ride out a craving and is good for your brain too (see Exercise and the Brain).
- If you slip, don't give up. Learn from it and set a new date.
If someone you care for has dementia
People with dementia may forget they've quit, or may be at risk of burns and fire from cigarettes. Talk with their doctor about nicotine replacement, and see Home Safety for fire safety tips.
The bottom line
It's never too late to quit. Stopping smoking is good for your heart, lungs and brain, and research suggests it can lower dementia risk even in your 60s and beyond. See Reducing Dementia Risk: The 14 Risk Factors for the other risk factors you can work on.
Sources
- World Health Organization (with Alzheimer's Disease International): Tobacco Use and Dementia (Tobacco Knowledge Summaries)
- Choi D et al. Effect of smoking cessation on the risk of dementia: a longitudinal study. Annals of Clinical and Translational Neurology, 2018
- Livingston G et al. Dementia prevention, intervention, and care: 2024 report of the Lancet Standing Commission. Lancet, 2024
- National Cancer Institute: Smokefree.gov
Not medical advice. This article is general information, not a diagnosis or treatment plan for any individual. Talk with a doctor about your situation.
Related articles
- Reducing Dementia Risk: The 14 Risk Factors
- Blood Pressure and the Brain
- Vascular Dementia
- Alcohol and the Brain
- Exercise and the Brain
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