Smoking and delayed wound healing

Why does smoking reduce oxygen supply to a transplanted hair graft?

A transplanted follicle has no blood supply of its own until the scalp builds one, so early survival depends entirely on the recipient area delivering oxygen and nutrients. Nicotine constricts the small blood vessels involved, while carbon monoxide binds haemoglobin ahead of oxygen, and together they reduce oxygen availability at the graft.

Why do clinics ask patients to stop smoking before surgery, not just after?

Stopping only after surgery misses the period when recipient sites are created and grafts are placed, so clinics commonly ask for cessation both before the procedure and afterwards, though exact windows vary by surgeon. Ask your own clinic for its figure and be honest about actual consumption so it can plan around you.

Are vaping and nicotine replacement safe alternatives to smoking before a hair transplant?

They are far better than smoking. Smoking itself is the main problem for healing, and in a randomised trial a nicotine patch during smoking abstinence did not raise wound infection rates compared with placebo. Evidence on vaping is thin, though. This is worth raising explicitly with your surgeon rather than assuming a substitute is exempt from the same restrictions.

What does general surgical research say about smoking and wound healing?

Impaired wound healing in smokers is a long-standing finding in general surgery, affecting both infection rates and wound breakdown. It isn't specific to hair transplantation, but the underlying mechanism applies with unusual directness to a procedure whose success depends on microvascular ingrowth into the transplanted grafts.

Ask your clinic for its own window, and read it alongside the wider aftercare guidance.

Sources

1. Sørensen LT. Wound healing and infection in surgery. The clinical impact of smoking and smoking cessation: a systematic review and meta-analysis. Archives of Surgery, 2012;147(4):373-383. pubmed.ncbi.nlm.nih.gov/22508785
2. Guo S, DiPietro LA. Factors affecting wound healing. Journal of Dental Research, 2010;89(3):219-229. pubmed.ncbi.nlm.nih.gov/20139336
3. Sørensen LT. Wound healing and infection in surgery: the pathophysiological impact of smoking, smoking cessation, and nicotine replacement therapy: a systematic review. Annals of Surgery, 2012;255(6):1069-1079. pubmed.ncbi.nlm.nih.gov/22566015
4. Sørensen LT, Karlsmark T, Gottrup F. Abstinence from smoking reduces incisional wound infection: a randomized controlled trial. Annals of Surgery, 2003;238(1):1-5. pubmed.ncbi.nlm.nih.gov/12832959
5. Romera de Blas C, Vega Díez D, Ricart Vayá JM, Gómez Zubiaur A. Complications in follicular unit excision hair transplantation: current evidence and practical approaches. Frontiers in Medicine, 2026;13:1750989. pubmed.ncbi.nlm.nih.gov/41709896

This article summarises published research and standard clinical practice. It is general educational information, not medical advice, and it does not replace the instructions your own surgical team gives you. Where their guidance differs from anything here, follow theirs.