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RO Smoking attacks the exact process a graft depends on. A transplanted follicle survives its first days on oxygen diffusing from surrounding tissue, until new vessels grow into it. Two components of tobacco smoke interfere with precisely that, and they do it by different routes.
| Agent | Effect |
|---|---|
| Nicotine | Narrows small vessels, cutting flow to skin and to the graft bed |
| Carbon monoxide | Occupies haemoglobin, so the blood that arrives carries less oxygen |
| Combined | Slower wound healing and delayed revascularisation |
Stopping works, and the length of the pause matters more than the act. Across surgery generally, a meta-analysis of randomised trials found preoperative cessation reduced postoperative complications by 41%, with each additional week of abstinence increasing the benefit by a further 19% and trials of at least four weeks showing a significantly larger effect (Mills et al., The American Journal of Medicine, 2011). That evidence comes from surgery as a whole, not from hair restoration specifically.
Nicotine replacement is not a neutral substitute. Patches, gum and vaping deliver the vasoconstrictor without the smoke. They remove one problem and keep the other, which is why the advice concerns nicotine rather than cigarettes alone.
The window that counts runs on both sides of surgery. The weeks before determine tissue condition; the weeks after cover the period when grafts are still establishing their blood supply.
Related terms
For how nicotine affects hair loss itself, see nicotine and hair loss. For the vaping question specifically, see vaping and hair loss.
