Medical Oncologist
CION Cancer Clinics
Stopping smoking before cancer surgery | CION Cancer Clinics
Stop smoking as early as you can before cancer surgery, ideally the day an operation is first discussed. The longer you are smoke-free, the better your lungs and wound are likely to cope, but even stopping a short time before still helps your oxygen levels. This page explains why, what changes once you stop, what help is available and what to ask your team. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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On this page
- How long before cancer surgery should you stop smoking?
- What changes in your body once you stop?
- What can help you stop smoking quickly?
- What does smoking do around surgery, and what does stopping change?
- What do smokers often believe before an operation?
- Will smoking stop you having surgery, and what can this page not tell you?
- Common questions about stopping smoking before surgery
The short answer
How long before cancer surgery should you stop smoking?
Stop as early as you can, ideally the day you learn surgery is planned. The longer you are smoke-free before the operation, the more your lungs, heart and wound benefit, but stopping even a short time before still helps.
Why smoking matters for an operation
Smoke fills the blood with carbon monoxide, a gas that takes the place of oxygen. It narrows small blood vessels, so less oxygen reaches the healing wound. It also makes the lungs produce more phlegm and clear it less well. After an operation that adds up to a higher chance of chest infections, slow wound healing and wound infection.
Why it is still worth stopping late
Some benefits start quickly. Carbon monoxide leaves the blood within a day or so of stopping, so more oxygen reaches the tissues. Other benefits, such as the lungs clearing phlegm better and wounds healing well, take longer. That is why earlier is better, and why late is still better than never. Do not wait for the operation date to be fixed before you stop.
This applies to beedis, cigarettes, hookah and cigars. Chewing tobacco, gutka and khaini also slow healing, especially after mouth surgery.After your last cigarette
What changes in your body once you stop?
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Within the first day or so
Carbon monoxide levels fall and your blood carries more oxygen. Your heart does not have to work as hard. This is why stopping even close to the operation still counts.
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Over the next few days
You may cough more at first. That is often the lungs starting to clear themselves, not a sign of harm. Cravings, irritability and poor sleep are common and usually ease with time.
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Over the following weeks
The tiny hairs that sweep phlegm out of the lungs begin working better. Blood flow to the skin improves. These are the changes that help most with chest infections and wound healing after surgery.
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After the operation
Staying smoke-free while you heal protects the wound and the lungs. Starting again straight after surgery undoes much of what you gained. If you have had a skin flap or reconstruction, smoking can starve the new tissue of blood, so staying off tobacco matters even more. Ask your surgeon how long they want you to stay smoke-free.
Not sure whether this applies to you?
Ask an oncologistGetting help
What can help you stop smoking quickly?
Stopping with help works far better than willpower alone. You do not need to do this without support.
Tell your team today
Say honestly how much you smoke or chew. Doctors are not there to judge. Knowing helps them plan your anaesthetic and your lung care, and they can point you to support.
Pick a stop day, ideally today or tomorrow, and tell your family so they can help you keep it.
Nicotine replacement
Patches, gum or lozenges give a small amount of nicotine without the smoke, which eases cravings.
Before you use it
- Ask your doctor which form suits you
- Ask whether to use it around the operation
Prescription medicines
Medicines such as varenicline or bupropion are sometimes prescribed to reduce cravings. They are not right for everyone, so a doctor decides whether you can take them. Never start them on your own.
Counselling and family
Tobacco cessation clinics and quitlines offer free counselling in several languages. At home, ask family members who smoke not to do so near you, and clear out lighters and packets.
When a craving hits
- Wait it out; cravings pass
- Drink water or chew fennel seeds
- Go for a short walk
Side by side
What does smoking do around surgery, and what does stopping change?
If you keep smoking
If you stop
Less oxygen in the blood during and after surgery
Oxygen levels start to recover quickly
More phlegm and a higher chance of chest infection
Lungs clear phlegm better over the weeks
Slower wound healing and more wound problems
Better blood flow to the healing skin
Cravings in hospital, where smoking is not allowed
Withdrawal is behind you before admission
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Commonly believed
What do smokers often believe before an operation?
"Stopping suddenly is dangerous before surgery."
For tobacco, this is not true. Withdrawal is unpleasant but not harmful. Some people cough more for a while as the lungs clear. Heavy alcohol is different, and stopping that suddenly does need a doctor.
"Beedis are milder than cigarettes."
Beedis deliver as much or more smoke and carbon monoxide, and they have to be puffed harder to stay lit. They are not a safer choice before surgery.
"Cutting down to a few a day is enough."
Cutting down is a step, and it is better than nothing. Stopping completely is what gives the lungs and wound the real benefit.
"An e-cigarette is fine to use instead."
Vapes avoid carbon monoxide, but they still contain nicotine and other chemicals. Ask your surgeon before using one, and do not use it in hospital without asking.
Did you know
The finger clip used on the ward cannot tell oxygen apart from carbon monoxide, so a smoker can look better on the monitor than their blood really is. Telling the anaesthetist you smoke matters.
Being straight with you
Will smoking stop you having surgery, and what can this page not tell you?
Cancer surgery is not usually cancelled because someone smokes. The team would rather you stop, and they may look more carefully at your lungs, but the decision to operate rests on many things. Do not hide your smoking to avoid delay. Being honest lets them prepare properly.
If you cannot stop completely
Some people cannot stop in time, especially with the stress of a diagnosis. If that is you, cut down as much as you can, keep trying and keep telling the team. Do not smoke on the day of the operation, and do not smoke while in hospital.
If you slip
Many people who stop have a cigarette or a beedi at a stressful moment. One slip does not mean you have failed, and it does not mean the effort so far was wasted. Throw the rest away, tell someone you trust, and start again that same day. Each smoke-free day before the operation still helps you.
What this page cannot tell you
This page cannot tell you exactly how many weeks are enough for your own operation, or how smoking has affected your lungs. Your surgeon, anaesthetist and lung tests answer those. Ask them: how are my lungs, is there support to stop, and can I use nicotine replacement around the operation?
Questions we are asked
Common questions about stopping smoking before surgery
My surgery is next week. Is it worth stopping now?
Yes. Carbon monoxide clears from the blood within a day or so, which means more oxygen for your heart and tissues during the operation. The bigger benefits for lungs and wound healing take longer, but you gain something from every smoke-free day. Stopping now is better than waiting until after.
Can I smoke on the morning of the operation?
No. Smoking on the day raises carbon monoxide in the blood just when the anaesthetist needs good oxygen levels. It can also make the airways more irritable. If cravings are strong, ask the team beforehand whether you can use nicotine replacement instead.
I chew gutka, not cigarettes. Does this apply to me?
Yes. Chewing tobacco also contains nicotine, which narrows blood vessels and slows healing. It is especially important to stop before mouth, throat or jaw surgery, where the wound is right where the tobacco sits. Tell your team exactly what you use and how often.
Can I use nicotine patches in hospital?
Many hospitals allow it, because patches carry no smoke or carbon monoxide. But your surgeon and anaesthetist should decide, especially for some operations involving skin flaps or reconstruction. Ask before admission rather than bringing your own without saying.
Will the anaesthetist know if I still smoke?
They often can tell from your breathing, your chest and sometimes a blood test. More importantly, they need to know so they can plan safely. Telling them honestly helps you. Nobody will refuse to care for you because you smoke.
My father has smoked for decades. Is there any point?
Yes. Long-term smokers still gain benefit from stopping before surgery, even though some lung damage will not reverse. Better oxygen and a clearer chest help in the days after the operation. Support from family makes a large difference to whether he manages it.
What about people who smoke around me at home?
Second-hand smoke irritates the lungs and makes cravings harder to resist. Ask family members to smoke outside and away from you, or better still to stop with you. A smoke-free home also helps once you come back to recover.
Can I start smoking again once I am home?
It is much safer not to. Your wound and lungs are still healing for weeks after you leave hospital. Smoking during that time raises the risk of wound problems and chest infection. Many people find the operation is the moment they stop for good.
Meet the Specialists
17+ senior cancer specialists. One panel for your case.
Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
Radiation Oncologist
Radiation Oncologist
Radiation Oncologist
Hematologist
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
Surgical Oncologist
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Sources
- NHS — Quit smoking
- National Cancer Institute — Tobacco cessation fact sheet
- NICE — Perioperative care in adults (NG180)
- American Cancer Society — Cancer surgery
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
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Stopping alcohol before surgeryWhy heavy drinking needs a doctor's help to stopBreathing exercises before chest and abdominal surgeryProtect your lungs alongside stopping smokingLung function tests before surgeryHow the team checks your lungsPrehabilitation before an operationOther ways to get stronger before surgery
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