Nicotine clears fast. Cotinine slower. Hair tests longest.

Nicotine itself clears the body quickly with a 1-2 hour half-life meaning most is gone within 24 hours of the last vape session. Cotinine (the main metabolite) has a longer 16-hour half-life and remains detectable for days to weeks depending on use pattern. Urine tests detect cotinine for 3-4 weeks in heavy users. Hair tests detect nicotine exposure for up to 3 months. Detection windows depend on test type, individual metabolism plus use patterns. Here is the full pharmacokinetic picture plus practical implications for testing contexts. For the craving experience see our cravings guide. For withdrawal symptoms see withdrawal duration. This article is general consumer information, not medical advice.

How your body processes nicotine

Following inhalation, nicotine undergoes a predictable pharmacokinetic process:

1. Absorption. Nicotine enters the bloodstream rapidly through alveoli in the lungs. Peak blood levels reached within 10-20 minutes of a vape session.

2. Distribution. Nicotine distributes throughout body tissues within minutes including crossing the blood-brain barrier where it produces its addictive effects.

3. Metabolism. The liver metabolises 70-80 per cent of nicotine into cotinine via the CYP2A6 enzyme. A smaller portion is metabolised via other pathways. Cotinine is further metabolised into trans-3-hydroxycotinine (3HC).

4. Elimination. Nicotine plus metabolites are eliminated mainly through urine. Small amounts via saliva, sweat plus breast milk. Kidney function affects elimination rate.

Half-life and clearance

Half-life is the time for blood concentration to drop by half. Practical implications:

Nicotine half-life: 1-2 hours.

• After 1 half-life (~2 hours): 50 per cent remains.
• After 2 half-lives (~4 hours): 25 per cent remains.
• After 5 half-lives (~10 hours): 3 per cent remains (clinically considered cleared).
• Nicotine is essentially gone from blood within 24 hours of last use.

Cotinine half-life: approximately 16 hours.

• After 16 hours: 50 per cent remains.
• After 48 hours: approximately 12 per cent remains.
• After 72 hours: approximately 6 per cent remains.
• After 5 half-lives (~3-4 days): clinically cleared from blood.

Cotinine is why drug tests can detect nicotine use days after the last vape session. Tests are typically designed to detect cotinine rather than nicotine itself because cotinine stays around longer.

Detection windows by test type

Different tests have different detection windows based on how long the substance persists in different body compartments:

Blood tests.

• Nicotine: Detectable for 1-3 days.
• Cotinine: Detectable for 7-10 days in most users.
• Used in medical settings, rarely for employment testing.
• Most accurate measure of recent exposure.

Urine tests.

• Occasional users: Cotinine detectable for 3-7 days.
• Regular users: Cotinine detectable for 2-3 weeks.
• Heavy users: Cotinine detectable for 3-4 weeks.
• Most common test for employment, insurance plus medical screening.
• Concentrations reported as ng/mL.
• Thresholds vary: often 200 ng/mL for regular user classification, 10 ng/mL for any detectable exposure.

Saliva tests.

• Nicotine: Detectable for 1-2 days.
• Cotinine: Detectable for 1-4 days.
• Less common than urine but used in some settings.
• Convenient collection.

Hair tests.

• Detection window: Up to 3 months (depending on hair length tested).
• Hair grows approximately 1 cm per month.
• Each cm reflects one month of exposure.
• Used in insurance contexts plus for confirming sustained cessation.
• Most expensive test type.

Factors affecting individual clearance

Significant individual variation exists. Factors affecting how fast you clear nicotine plus cotinine:

Genetic factors.

• CYP2A6 enzyme activity varies by genotype. Fast metabolisers clear nicotine 2-3x faster than slow metabolisers.
• Approximately 10-15 per cent of people are slow metabolisers.
• Ethnic variation exists: average differences between populations.

Sex and age.

• Women metabolise nicotine approximately 10-20 per cent faster than men.
• Older adults metabolise nicotine slower than younger adults.
• Children plus adolescents metabolise similarly to adults.

Physiological state.

• Pregnancy: Accelerated metabolism, faster clearance.
• Kidney function: Impaired kidney function slows elimination.
• Liver function: Impaired liver function slows metabolism.
• Hydration: Adequate hydration supports normal elimination.

Use pattern.

• Heavy regular users: More nicotine to clear plus some accumulation effects.
• Recent last use: Fresh blood levels take longer to clear than background levels.
• Cumulative exposure: Years of heavy use may extend detection marginally.

Other factors.

• Menthol in vape: Slightly slows nicotine metabolism.
• Alcohol: May slow nicotine clearance slightly.
• Other medications: Some affect CYP2A6 activity.
• Exercise: Negligible effect on clearance despite common belief.

Can you speed up clearance?

Short answer: not much. The liver does most of the work plus liver enzyme activity is largely fixed by genetics. However:

• Stay well hydrated. Supports kidney elimination of metabolites.
• Exercise generally. Supports overall health though minimal direct clearance effect.
• Avoid compounds that slow metabolism. Menthol, some medications.
• Eat adequate protein. Supports liver enzyme production.
• Time is the main factor. Just stop using and wait.

Popular “detox” products claiming to speed nicotine clearance have little evidence base plus may not work. Legitimate testing contexts care more about consistent use patterns than single-instance clearance.

Common testing contexts in the UK

Life insurance applications.

• Cotinine testing common for applications above certain coverage amounts.
• Positive test typically classifies you as smoker or nicotine user for pricing.
• Cessation for 12-24 months before application typically required for non-smoker rates.
• Vape use classified similarly to smoking for insurance purposes usually.

Medical tests.

• Cotinine testing before certain surgeries.
• Part of pre-operative assessment.
• May affect surgical scheduling plus recommendations.
• Always be honest with medical team rather than trying to hide use.

Employment testing.

• Less common than drug testing but happens in some roles.
• More common in health insurance-linked employment.
• Tobacco use may affect pricing or hiring in some sectors.
• Vape typically tested as equivalent to smoking.

Dental and healthcare.

• Dentists may order cotinine testing before some procedures.
• Used to assess surgical risk plus inform post-procedure care.

Why cessation experience outlasts pharmacokinetics

A crucial point: the body clears nicotine within days but the cessation experience lasts weeks to months. Reasons:

• Receptor changes persist. The upregulated nicotinic receptors in your brain do not reset when nicotine clears from blood.
• Conditioned habits persist. Learned associations between triggers plus nicotine take months to extinguish.
• Neurological adaptation. Brain circuits modified by chronic nicotine take time to adjust.
• Psychological plus emotional patterns. Stress coping, social patterns, daily routines all need rebuilding.

This is why cravings can persist for months even though nicotine itself is long gone. The compound clears quickly. The adaptation takes longer.

Practical approach

• For cessation: stop and wait. Nicotine clears within days. Cotinine within weeks.
• For testing: plan ahead. Heavy users need 2-4 weeks for urine clearance.
• For insurance applications: 12-24 months typical requirement.
• Hydrate well supports normal elimination.
• Do not trust quick-detox products. Limited evidence they work.
• Be honest in medical contexts. Hiding use affects your care quality.

For step-down nicotine reduction, our nicotine salts collection covers every UK compliant strength from 20mg down to 3mg.

For the wider view on vape, cessation plus testing contexts, our full health hub covers every major question UK readers ask.