In almost any operation, tobacco is the modifiable factor that weighs most heavily on the result. Put like that it sounds like general health advice, and it is not.
It is the one risk in your surgery that depends entirely on you, and the one that most changes the outcome. It is worth explaining why.
What it actually does to a wound
Nicotine constricts the small blood vessels. Not the large ones: the capillaries, which are precisely the ones that have to bring blood to the edge of a wound for it to heal. Carbon monoxide takes the place of oxygen in the blood, so the little that arrives arrives less well loaded.
The practical result: the skin you have just operated on receives less blood and less oxygen for weeks. That skin does not die in theatre; it dies afterwards, around the fifth to seventh day, when everything seemed to be going well.
Skin necrosis in a smoker is almost never seen on the first day. It appears once the patient had relaxed, and by then there is nothing to undo.
Where it shows most
In operations that raise a flap of skin and close it under tension, which are exactly the largest ones:
- Abdominoplasty. The skin of the lower abdomen depends on a blood supply the surgery has already reduced. Tobacco on top of that is what produces those midline necroses that take months to close and leave a far worse scar.
- Breast surgery with a lift. The nipple survives because it keeps a pedicle of tissue supplying it. Smoking compromises exactly that.
- Facelift. Thin, long flaps — the setting with the least margin of all.
- Fat grafting. Fat takes if vessels grow around it. Without microcirculation, it does not take.
- Any reconstructive graft or flap. Here tobacco does not worsen the result: it makes the operation fail.
How long before, and until when
What is usually asked for is four weeks before and four weeks after. That is not a round number picked at random: it is how long the microcirculation takes to recover and how long the critical phase of healing lasts.
And the "after" matters as much as the "before". Some patients stop for a month, have the operation and go back to smoking on the third day because the hard part is over. The hard part is not over: the skin that is going to suffer has not yet decided whether it survives.
Two things worth clarifying
- Vaping is not an alternative. What constricts the vessels is nicotine, and the vape carries it. So do patches and gum. If your plan for stopping involves nicotine replacement, say so in the consultation: it can be planned around, but it has to be known.
- Smoking "a little" counts too. There is no safe number of cigarettes a day before major surgery. Two or three constrict as well.
And if you cannot stop
Then it has to be talked about, not hidden. That is what really matters here.
A patient who says "I am not going to manage it" makes planning possible: choosing a technique with less flap and less tension, splitting the surgery into two stages, postponing it, or deciding together that this is not the moment. A patient who says she stopped and did not is operated on with a risk nobody has accounted for, and that ends badly often enough not to be worth it.
The question is not asked in order to judge. It is asked because it changes the operation.
What is promised
That stopping works. It is not a symbolic gesture or an administrative requirement: four weeks without nicotine restore much of the microcirculation, and the difference in the rate of healing problems is large and measured.
It is probably the single most effective thing you can do yourself for the result of your own operation.