Every year, plenty of UK smokers put off quitting until their symptoms feel impossible to ignore. The trouble is, by the time some signs are hard to miss, real damage may already have been done.
Spotting the early warning signs, like a cough that won't shift, getting out of breath on the stairs or changes in the mirror, can be one of the strongest reasons to quit sooner rather than later.
Effective stop smoking treatments are available, and the health benefits of quitting start almost straight away. Here are five signs that smoking is already affecting your body, and that now's a better time than ever to act.
1. You have a persistent cough
A cough that won't go away is one of the earliest signs that smoking is damaging your airways.
Your airways are lined with tiny hair-like structures called cilia, which normally sweep mucus and debris out of your lungs. Tobacco smoke paralyses them. When they stop working properly, mucus builds up and your body has to rely on coughing to clear it instead.1
Coughing up blood, or a cough that's changed or lasted more than three weeks? Contact your GP promptly.
Many smokers write this off as a normal part of smoking. But a cough that never goes away isn't normal.
A chesty cough that brings up phlegm on most days for three months or more is the clinical definition of chronic bronchitis. That's one of the main parts of chronic obstructive pulmonary disease (COPD), a long-term lung condition.
COPD gets worse over time and can't be cured. Smoking is its main cause, behind around 85% of cases.2
The NHS advises that any smoker or former smoker over 35 with ongoing breathing symptoms should see a GP. Early COPD can be picked up with a simple breathing test called spirometry, so treatment can start before you lose a lot of lung function.1
Quitting is the single most effective way to slow COPD down, and a smoker's cough often starts to improve within weeks to months of stopping.
2. You get breathless more easily than you used to
Getting short of breath on the stairs, walking quickly or doing things that used to feel easy is worth taking seriously. Many smokers put it down to being unfit. But in people who smoke, struggling with exercise is often a sign that their lungs aren't working as well as they used to.2
Smoking causes ongoing inflammation and narrowing of your airways. It also damages the alveoli, the tiny air sacs in your lungs where oxygen passes into your blood.
Lung function in people with COPD can drop a lot before symptoms start getting in the way of daily life. So by the time breathlessness is affecting your routine, significant damage may already have happened.
Breathlessness can also come from the effects of smoking on your heart and blood vessels. Carbon monoxide from cigarette smoke reduces how much oxygen your blood can carry. Nicotine makes your blood vessels narrow and your heart work harder.
Breathless at rest, or breathless with chest pain? Call 999 straight away.
Together, these cut the oxygen reaching your muscles and organs when you're active. Quitting takes both burdens away quickly. Carbon monoxide levels start to fall within eight hours of stopping, and your circulation usually improves within two to twelve weeks.3
3. Your skin has changed
The effect of smoking on your skin is a visible sign of damage that's often happening throughout your body at the same time.
Cigarette smoke reduces blood flow to your skin and limits the oxygen and nutrients reaching it. It also speeds up the breakdown of collagen and elastin, the proteins that keep skin firm and supple.4
Multiple studies have confirmed that smoking is a major risk factor for early facial wrinkles. Research cited by Action on Smoking and Health (ASH) found that smokers in their 40s can have as many wrinkles as non-smokers in their 60s. Skin damage can start to show as early as your 20s or 30s.4
The skin of heavy smokers also tends to look greyish and uneven, because of poor blood flow to the skin.
Skin damage from smoking isn't just cosmetic. The same processes that break down collagen in your skin, like oxidative stress, reduced blood flow and inflammation, are affecting other organs at the same time.
Quitting helps your skin too. Better blood flow means more oxygen and nutrients reach your skin cells.
Quitting improves blood flow to your skin, so your cells get the oxygen and nutrients they need. Some smoking-related skin changes, like uneven colouring, have been shown to improve within weeks of stopping.
4. You notice signs of poor circulation
Cold hands and feet, slow-healing cuts, pins and needles or reduced feeling in your fingers and toes can all be signs that smoking is affecting your circulation.
Nicotine makes your blood vessels narrow, reducing blood flow to your hands, feet and other areas furthest from your heart. Carbon monoxide also takes the place of oxygen in your blood, so less oxygen reaches your tissues.3
Even people who smoke fewer than five cigarettes a day can show early signs of heart and circulation disease.5
Smoking speeds up atherosclerosis, the build-up of fatty deposits inside your artery walls. Over time, this narrows your blood vessels and reduces blood flow. It affects the large arteries supplying your heart and brain, as well as the smaller vessels supplying your limbs and organs.
Sudden pain, coldness or colour change in a leg or foot needs urgent medical attention. Do not wait to see if it settles.
Slow wound healing is another common sign. When less oxygen reaches your tissues, healing slows down, and the risk of complications after procedures goes up.
Circulation starts to improve within two to twelve weeks of quitting. Within a year of stopping, your extra risk of coronary heart disease drops to around half that of someone who still smokes.
5. You're experiencing erectile dysfunction
Erectile dysfunction (ED) in men who smoke is often a circulation problem rather than a psychological one.
An erection depends on healthy blood vessels. In particular, the lining of your blood vessels (the endothelium) needs to produce nitric oxide, which lets blood flow into the penis. Smoking damages this lining and the small blood vessels that supply the penis, making erections harder to get and keep.6
Research confirms that smoking is linked to ED independently of its wider effects on heart disease. The arteries in the penis are smaller than the ones supplying the heart. So the same damage to blood vessels often shows up as ED before it causes any chest symptoms.
That's why clinicians describe ED in smokers as a possible early warning sign of damage that may also be happening in the arteries to the heart.6 If you have unexplained ED, talk to a GP about your heart health, as an assessment is usually advised before starting any ED treatment.
ED can be an early warning sign for your heart. It's worth a check-up, not just a prescription.
Stopping smoking can improve erections, especially if ED hasn't become severe or long-standing. If you have ED alongside other signs of poor circulation, quitting is the most effective step you can take to tackle the cause. A licensed stop smoking treatment such as varenicline can help.7
Frequently asked questions
What happens when you stop smoking?
The effects begin within hours. After eight hours, carbon monoxide levels in the blood drop by around half, and oxygen levels start to normalise. After 48 hours, the nerve endings begin to regrow and your senses of taste and smell start to improve. Within two to twelve weeks, circulation improves and lung function begins to recover. After one year, the excess risk of coronary heart disease is roughly half that of someone who continues to smoke. The timeline is incremental, but the direction is consistently positive from the moment you stop.
What are the symptoms of stopping smoking?
Withdrawal symptoms occur because the body has become physically dependent on nicotine. Common symptoms include cravings, irritability, low mood, difficulty concentrating, increased appetite, and disrupted sleep. These are usually strongest in the first three to five days and typically ease significantly within two to four weeks. They are a sign that your body is adjusting, not that something has gone wrong. Using a licensed stop smoking treatment such as varenicline or nicotine replacement therapy can significantly reduce the intensity of withdrawal symptoms.
How long does it take for smoking cravings to stop?
Individual cravings tend to last around five to ten minutes and become less frequent over time. Most people find the physical withdrawal is largely resolved within two to four weeks of stopping. Psychological triggers - situations, habits, or environments associated with smoking - can prompt cravings for longer, sometimes months. Having a strategy for those moments, and using pharmacological support during the acute phase, meaningfully improves the chances of getting through them without relapsing.
Can you reverse the damage smoking causes to your lungs?
Partially, depending on how much damage has occurred. Lung function can improve after quitting, and the rate of decline in people with COPD slows significantly when smoking stops. In the early stages, before structural changes become severe, some recovery is possible. However, significant emphysema - where the air sacs in the lungs have been destroyed - is not reversible. This is why stopping earlier produces better outcomes. If you have symptoms such as breathlessness or a persistent cough, ask your GP about a spirometry test to assess your current lung function.
Is it ever too late to benefit from quitting smoking?
Rarely. Even older smokers who have smoked for decades gain meaningful health benefits from stopping. The risk of heart attack and stroke begins to fall within the first year. The risk of lung cancer approximately halves within ten years compared to continuing smokers. Quality of life, breathing, circulation, and energy levels all tend to improve regardless of when you quit. The sooner you stop, the greater the benefit.
References
- NHS. Chronic obstructive pulmonary disease (COPD). nhs.uk
- Global Initiative for Chronic Obstructive Lung Disease (GOLD). GOLD 2024 Report. goldcopd.org
- NHS Better Health. Managing nicotine withdrawal symptoms. nhs.uk
- Action on Smoking and Health (ASH). How smoking affects the way you look. ash.org.uk
- Oxford Health NHS Foundation Trust. Quit smoking. oxfordhealth.nhs.uk
- Uddin SMI, Mirbolouk M, Dardari Z, et al. Erectile dysfunction as an independent predictor of future cardiovascular events: the Multi-Ethnic Study of Atherosclerosis. Circulation. 2018;138(5):540-542. doi:10.1161/CIRCULATIONAHA.118.033990
- National Centre for Smoking Cessation and Training (NCSCT). Generic varenicline briefing. August 2024. ncsct.co.uk
This article is intended for informational purposes only and does not replace professional medical advice. Always read the patient information leaflet supplied with your medication and speak to a healthcare professional if you have specific concerns.