# Smoking cessation in cancer patients

Source: https://onco.cc/technologies/smoking-cessation-after-diagnosis/  
OnCo record `smoking-cessation-after-diagnosis` (Technology). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Stopping smoking after a cancer diagnosis improves survival, reduces treatment complications and second cancers, and is the single most effective supportive intervention that oncology services still routinely fail to deliver.

## Summary

Continued smoking after diagnosis increases all-cause and cancer-specific mortality (2014 Surgeon General's report: about 50% higher risk of death in lung and head and neck cancer), impairs wound healing and radiotherapy response, increases chemotherapy toxicity and treatment interruptions, and raises the risk of second primary cancers. In a prospective cohort study of 517 people in Moscow who were smoking when early-stage non-small-cell lung cancer was diagnosed (Annals of Internal Medicine 2021), those who quit had a lower risk of death from any cause (hazard ratio 0.67) and of progression (hazard ratio 0.70), and a five-year overall survival of 60.6 against 48.6 per cent; the study was observational, not a randomised trial, and smoking was self-reported. Evidence-based treatment is varenicline or cytisine plus behavioural support, which doubles or triples quit rates. Despite this, fewer than half of cancer centres systematically assess and treat tobacco use; the NCI Cancer Center Cessation Initiative (C3I) and the UK's opt-out 'Cure' model demonstrate that embedding cessation into oncology pathways lifts treatment rates from single digits to over 50%.

## Fields

- Kind: Technology
- Status: established
- Last checked: 2026-09-08
- Principle: Removing ongoing carcinogen exposure and hypoxia-inducing carboxyhaemoglobin improves radiotherapy oxygen enhancement and drug metabolism, halts field cancerisation, and lowers cardiovascular competing risk.
- Strengths: Large survival effect in lung and head and neck cancer; Cheap, effective drugs available; Opt-out models are proven to raise uptake
- Limitations: Under-delivered: most patients never offered treatment; Stigma and fatalism among patients and clinicians; Reimbursement gaps for cessation pharmacotherapy

## Sources

- Wikipedia: https://en.wikipedia.org/wiki/Smoking_cessation
- NCI Cancer Center Cessation Initiative: https://cancercontrol.cancer.gov/brp/tcrb/cessation-initiative
- Sheikh et al., Postdiagnosis smoking cessation and reduced risk for lung cancer progression and mortality: a prospective cohort study (Ann Intern Med 2021): https://doi.org/10.7326/M21-0252

## Connected records

- ideas: [Every lung screening visit includes stop-smoking medicine, opt-out](https://onco.cc/ideas/idea-prev-opt-out-cessation-in-lung-screening/), [Stop-smoking treatment offered to every person who smokes at a cancer diagnosis, as part of cancer care](https://onco.cc/ideas/idea-upgrade-stop-smoking-treatment-at-diagnosis/)
- cancers: [Bladder & urothelial cancer](https://onco.cc/cancers/urothelial/), [Buccal mucosa and gingivobuccal cancer (oral cancer in India)](https://onco.cc/cancers/buccal-mucosa-cancer/), [Cervical cancer](https://onco.cc/cancers/cervical/), [Head and neck squamous cell carcinoma](https://onco.cc/cancers/head-and-neck/), [HPV-negative head and neck squamous cell carcinoma (including HPV-negative oropharyngeal cancer)](https://onco.cc/cancers/hpv-negative-head-and-neck-cancer/), [Hypopharyngeal cancer](https://onco.cc/cancers/hypopharyngeal-cancer/), [Laryngeal and hypopharyngeal cancer](https://onco.cc/cancers/laryngeal-cancer/), [Lip cancer](https://onco.cc/cancers/lip-cancer/), [Non-small-cell lung cancer](https://onco.cc/cancers/nsclc/), [Oesophageal cancer](https://onco.cc/cancers/esophageal/), [Oesophageal squamous cell carcinoma](https://onco.cc/cancers/oesophageal-squamous-cell-carcinoma/), [Oral cavity cancer (mouth and tongue)](https://onco.cc/cancers/oral-cavity-cancer/), [Oral tongue and floor of mouth cancer](https://onco.cc/cancers/oral-tongue-cancer/), [Oropharyngeal cancer (tonsil and base of tongue)](https://onco.cc/cancers/oropharyngeal-cancer/), [Small-cell lung cancer](https://onco.cc/cancers/sclc/)
- fronts: [Diet, Exercise & Lifestyle](https://onco.cc/fronts/nutrition-lifestyle/), [Prevention & Risk](https://onco.cc/fronts/prevention/), [Supportive Care & Survivorship](https://onco.cc/fronts/supportive-care/)
- technologies: [Breathing and exercise capacity after lung resection](https://onco.cc/technologies/rejuv-rehab-respiratory/), [Early integrated palliative care](https://onco.cc/technologies/palliative-care/), [Low-dose CT lung screening](https://onco.cc/technologies/low-dose-ct-screening/), [Survivorship care and late-effects surveillance](https://onco.cc/technologies/survivorship-care-plan/), [What a prehabilitation programme actually contains, and how long it needs](https://onco.cc/technologies/rejuv-rehab-prehabilitation-programme/)
- institutions: [National Cancer Institute (NIH)](https://onco.cc/institutions/nci/)
- bottlenecks: [Fragmented care and guideline gaps](https://onco.cc/bottlenecks/b-care-fragmentation/), [Prevention we already have is not deployed](https://onco.cc/bottlenecks/b-prevention-adoption/), [Survivorship and late effects are neglected](https://onco.cc/bottlenecks/b-survivorship/)
- key papers: [Postdiagnosis Smoking Cessation and Reduced Risk for Lung Cancer Progression and Mortality: A Prospective Cohort Study](https://onco.cc/key-papers/paper-sheikh-ann-intern-med/), [Smoking, smoking cessation, and lung cancer in the UK since 1950: combination of national statistics with two case-control studies](https://onco.cc/key-papers/paper-peto-smoking-cessation-lung-cancer-uk-bmj-2000/)
- terms: [Family Smoking Prevention and Tobacco Control Act 2009](https://onco.cc/terms/tobacco-control-act/), [Stopping smoking](https://onco.cc/terms/smoking-cessation/), [Tobacco 21](https://onco.cc/terms/tobacco-21/)
- trials: [YLST](https://onco.cc/trials/ylst/)
- pathways: [Mutagenesis & mutational signatures](https://onco.cc/pathways/mutagenesis-signatures/)
- roadmaps: [Cancer prevention roadmap: tobacco control and vaccines → biomarker-guided chemoprevention → interception in carriers](https://onco.cc/roadmaps/prevention-roadmap/), [Diet, exercise and lifestyle roadmap: causes established → interventions that disappointed → exercise proven as treatment](https://onco.cc/roadmaps/nutrition-lifestyle-roadmap/)

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