Substance guides

How long does nicotine stay in your system?

Published January 11, 2026 · 7 min read · Updated April 2026

Reviewed for accuracy by licensed clinical professionals.

Nicotine itself has a short half-life of 1-2 hours, but its metabolite cotinine is what most tests detect, with a much longer detection window.

Detection by test type

Blood: cotinine for 1-10 days. Urine: cotinine for 3-4 days (occasional) to 15-20 days (heavy smoker). Saliva: 1-4 days. Hair: up to 90 days.

Why testing matters

Life and health insurance companies test cotinine to set tobacco user rates. Smokers pay 15-50% higher premiums. Some employers test as a condition of employment. Surgical programs may require clearance before elective procedures.

Clearing for insurance tests

Most insurance tests use a 200 ng/mL cutoff. Light smokers may clear in 5-7 days. Heavy smokers need 2-3 weeks. All nicotine products including patches and gum produce cotinine and will trigger a positive test.

Authoritative sources

This article references guidelines from: NIDA · SAMHSA · CDC

Frequently asked questions

How long does nicotine stay in urine?

Cotinine is detectable for 3-4 days after occasional use and 15-20 days after heavy chronic smoking.

Do nicotine patches show on a cotinine test?

Yes. All nicotine products produce cotinine. You must stop all nicotine to clear the test.

How long before an insurance test should I quit?

Light smokers: 5-7 days. Heavy smokers: 2-3 weeks. Stop all nicotine products including patches and gum.

Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.