You have surgery coming up. The surgeon (or anaesthetist) has told you to quit smoking. You wonder why they insist so much — especially if the operation has nothing to do with tobacco.

The answer: because it is one of the interventions where every week without a cigarette counts, in proportions you would not imagine. And the effect is measurable, at every stage.

Why tobacco sabotages your surgery

It all plays out on three fronts.

1. Oxygen, missing everywhere

Carbon monoxide (CO) takes oxygen's place on your haemoglobin. Your tissues receive less oxygen, your healing is slower, your wounds take longer to close.

2. Your vessels, in constriction mode

Nicotine and smoke cause a lasting vasoconstriction of the small vessels. Your bone grafts, sutures and reconstructions receive less blood. The risk of necrosis or suture breakdown explodes.

3. Your immunity, dialled down

Smokers have fewer active immune cells. The result: more surgical site infections, more post-op pneumonias, more resistant bacteria.

The 6-to-8-week rule, explained

All surgical professional societies converge: 6 to 8 weeks of cessation before the operation is the standard.

1. From 12 hours CO is cleared, your blood carries more oxygen.
2. 2 to 4 weeks immune function starts to recover.
3. 3 to 4 weeks significant reduction in wound-healing complications.
4. 4 weeks reduction in respiratory complications.
5. 6 to 8 weeks maximum benefit, "non-smoker" level on most markers.

A weekly-gain logic

The benefit is not binary. Each additional week of cessation reduces the risk of complications, up to about 8 weeks:

The concrete complications you reduce

Concretely, by quitting before the operation, you cut your risk of:

• surgical site infections (up to −50%),

• suture breakdown or wound dehiscence,

• post-operative pneumonia (×2 to ×3 in smokers),

• pulmonary embolism,

• anaesthetic complications (difficult intubation, desaturation),

• extended stay in intensive care,

• 30-day readmission.

Specific case: vascular-stakes surgery

For some surgeries, quitting is no longer advice — it is a requirement:

And after the operation?

The benefit continues. Resuming cigarettes in the days following the operation cancels a large part of the benefits gained. Healing continues for at least 4 to 6 weeks after major surgery.

How to go about it in practice

1. 1

   Book an appointment with a tobacco-cessation specialist as soon as the operation date is announced — many hospitals have a dedicated consultation.

2. 2

   Combine nicotine substitutes + support

   that is the most effective combo.

3. 3

   Do not blame yourself if you cannot manage 8 weeks

   every week counts. 4 weeks is already a major benefit.

4. 4

   Carry on after the operation. Use the hospital stay (where you are already off cigarettes by necessity) to anchor the quit.

And vaping before surgery?

Vaping sharply reduces exposure to carbon monoxide and tar. It is less risky than smoking before an operation, without being entirely neutral. Nicotine on its own has a slight vasoconstrictor effect — as a precaution, some surgeons ask you to stop all nicotine 1 to 2 weeks beforehand for delicate vascular surgery.

To discuss case by case with your anaesthetist.

In United Kingdom

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