Smoking cessation
Exam Tips
- In OSCEs, score dependence quickly using time-to-first-cigarette and cigarettes/day, then offer combined behavioural support plus pharmacotherapy.
- For UK exams: the most effective routine strategy is specialist stop-smoking support plus medication, not advice alone.
- Know core withdrawal symptoms: irritability, anxiety, poor concentration, increased appetite, low mood, insomnia.
- State key contraindications: bupropion and seizure/eating-disorder history; dose-adjust varenicline in renal impairment; prefer NRT in pregnancy if medication required.
- Cardiovascular viva point: smoking is a major reversible vascular risk factor; quitting halves excess MI risk by about 1 year and keeps improving thereafter.
- Visual memory aid: review a smoking-cessation timeline figure (acute to long-term benefits) in your core medicine textbook cardiovascular prevention chapter.
Definition
Tobacco dependence is a chronic relapsing condition driven by nicotine addiction, conditioned behavioural cues, and psychosocial factors, and it should be managed as a long-term disease rather than a one-off lifestyle choice. Smoking cessation is the structured clinical process of identifying smokers, offering behavioural support plus effective pharmacotherapy, and preventing relapse to reduce cardiovascular, respiratory, cancer, and pregnancy-related harm.
Pathophysiology
Nicotine rapidly reaches the brain and stimulates nicotinic acetylcholine receptors (especially alpha4beta2), causing dopamine release in mesolimbic reward pathways and reinforcing repeated use. Chronic exposure leads to neuroadaptation (receptor upregulation and tolerance), so stopping smoking produces withdrawal symptoms such as irritability, anxiety, low mood, poor concentration, restlessness, increased appetite, and insomnia. Tobacco smoke also causes endothelial dysfunction, oxidative stress, platelet activation, inflammation, and adverse lipid effects, accelerating atherosclerosis and thrombosis; this explains why cessation has major cardiovascular benefit within months to years.
Risk Factors
- Socioeconomic deprivation, unemployment, and routine/manual occupations
- Serious mental illness (high smoking prevalence and dependence burden)
- Household or peer smoking exposure (including parental smoking in adolescents)
- LGBTQ+ populations with higher smoking prevalence in UK data
- Early age of smoking initiation and high daily cigarette consumption
- Strong nicotine dependence (short time to first cigarette after waking)
- Previous failed quit attempts without behavioural/pharmacological support
- Comorbid alcohol or substance misuse
Clinical Features
Symptoms
- Craving for cigarettes/nicotine
- Irritability, frustration, or anger on cessation
- Anxiety, restlessness, and reduced concentration
- Low mood and sleep disturbance (insomnia)
- Increased appetite and concern about weight gain
- Cough/wheeze or exertional breathlessness from smoking-related airway disease
Signs
- Smell of smoke on clothes or breath
- Nicotine staining of fingers/teeth and poor oral health
- Raised pulse or blood pressure compared with post-cessation baseline
- Wheeze or reduced air entry in smokers with coexisting respiratory disease
- Carbon monoxide positivity on expired-air monitoring
Investigations
Management
Lifestyle Modifications
- Use very brief advice at each contact: Ask smoking status, Advise best quit method, Act by offering treatment/referral
- Offer referral to NHS/local stop smoking service; combine behavioural support with medication for highest quit success
- Set a quit date, identify cues/triggers, agree coping strategies, and arrange early follow-up (first 1-2 weeks)
- Offer harm-reduction pathways for people not ready to quit abruptly (including switching support and e-cigarette discussion)
- Provide written/verbal education on withdrawal being temporary and on realistic weight-gain prevention through diet and activity
- Document smoking status and revisit sensitively at every appropriate clinical encounter
Pharmacological Treatment
Nicotine replacement therapy (NRT)
- Nicotine patch 21 mg/24 h daily (or 25 mg/16 h) for heavier smokers, then step down (e. g, 14 mg then 7 mg) over about 8-12 weeks
- Nicotine gum 2 mg (or 4 mg if high dependence), typically 8-12 pieces/day, maximum 15 pieces/day
- Nicotine lozenge 1 mg or 2 mg as needed for cravings
- Nicotine inhalator 15 mg cartridge, frequent puffing as required
- Nicotine mouth spray 1 mg/spray, 1-2 sprays when cravings occur (within product maximum)
Use combination NRT (patch plus short-acting form) for better efficacy than single-form NRT. NRT is generally safer than continued smoking, including in most cardiovascular patients; seek specialist advice in unstable acute cardiac states. In pregnancy, behavioural support first-line; if medication needed, NRT is usually preferred to varenicline or bupropion.
Partial nicotinic receptor agonist
- Varenicline: 0.5 mg once daily on days 1-3, 0.5 mg twice daily on days 4-7, then 1 mg twice daily from day 8 for 11 further weeks
Start 1-2 weeks before quit date (or set quit between days 8-14). Common adverse effects include nausea, vivid dreams, and insomnia. Adjust dose in significant renal impairment (e. g, severe CKD: maximum 1 mg daily). Monitor mood/behaviour change, especially with psychiatric history.
Atypical antidepressant for cessation
- Bupropion (modified release): 150 mg once daily for 6 days, then 150 mg twice daily; start 1-2 weeks before quit date; usual course 7-9 weeks
Contraindicated in seizure disorder, current/past bulimia or anorexia nervosa, CNS tumour, bipolar disorder risk contexts, and during abrupt alcohol/benzodiazepine withdrawal; avoid with MAOIs. Can cause insomnia and dry mouth; use caution with interacting drugs that lower seizure threshold.
Complications
- Relapse after initial abstinence
- Withdrawal-related distress, sleep disturbance, and short-term functional impairment
- Post-cessation weight gain (commonly several kilograms over time if lifestyle not addressed)
- If smoking continues: myocardial infarction, stroke, peripheral arterial disease, COPD progression, and smoking-related cancers
- Pregnancy complications (placental problems, preterm birth, fetal growth restriction, stillbirth)
- Second-hand smoke harms in household contacts, especially children
Prognosis
Prognosis improves substantially with sustained abstinence: pulse and carbon monoxide improve within hours, respiratory symptoms and exercise tolerance improve over weeks to months, and cardiovascular risk falls progressively (with major reduction by 1 year and near never-smoker myocardial infarction risk by about 15 years). Earlier cessation gives larger life-expectancy gain, but stopping at any age remains clinically meaningful.
Sources & References
🏥BMJ Best Practice(1)
💊BNF Drug References(3)
- Cytisinicline[management.pharmacological]
- Riociguat[cautions]
- Varenicline[management.pharmacological]
✅NICE Guidelines(1)
- Smoking cessation[overview]
📖Textbook References(20)
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1712)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 849)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1428)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1428, 1429)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 563, 564)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 612, 613)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 191, 192)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1306)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 612, 613)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 593)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 564)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1428)[context]
- Oxford Handbook of Clinical Diagnosis (Huw Llewelyn, Hock Aun Ang, Keir Lewis etc.) (Z-Library).pdf(pp. 417)[context]
- Oxford Handbook of Clinical Diagnosis (Huw Llewelyn, Hock Aun Ang, Keir Lewis etc.) (Z-Library).pdf(pp. 310, 311)[context]
- Oxford Handbook of Clinical Diagnosis (Huw Llewelyn, Hock Aun Ang, Keir Lewis etc.) (Z-Library).pdf(pp. 418, 419)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 391)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 822, 823)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 739)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 729)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 724)[context]