How Long Does Nicotine Stay in Your System?

Whether you’re preparing for a nicotine test or just curious about the science, here’s exactly how long nicotine and its metabolites remain in your body.

Nicotine vs. Cotinine

Most nicotine tests actually detect cotinine, a metabolite your liver produces when it breaks down nicotine. Cotinine stays in your system much longer than nicotine itself, which is why it’s the preferred biomarker for testing.

Nicotine has a half-life of about 2 hours, meaning it’s mostly cleared from your blood within 8–12 hours. Cotinine has a half-life of about 16 hours, taking several days to become undetectable.

Detection Windows by Test Type

Blood tests detect cotinine for 1–3 days after last nicotine use in occasional users, and up to 10 days in heavy, long-term users. Blood tests are considered the most accurate method for measuring recent nicotine use.

Urine tests are the most common testing method. Cotinine is detectable in urine for 3–4 days in average users, and potentially up to 15–20 days in very heavy users. Urine tests have a lower cost than blood tests, which is why they’re used most frequently.

Saliva tests can detect cotinine for 1–4 days. They’re gaining popularity because they’re non-invasive and easy to administer. Some saliva tests can detect nicotine itself for up to 24 hours.

Hair tests have the longest detection window — cotinine can be detected in hair follicles for up to 90 days (3 months) or even longer. Hair tests are less common due to cost but are used when a longer detection window is needed.

Factors That Affect Clearance

Several variables influence how quickly your body processes nicotine.

Amount and frequency of use. Heavier users accumulate more nicotine and cotinine, which takes longer to clear. A person who vapes 5 times a day will clear nicotine much faster than someone who vapes 50 times a day.

Metabolism. Individual metabolic rates vary significantly. Genetics play a major role — some people have enzyme variants that process nicotine up to 3 times faster than average.

Age. Older adults generally metabolize nicotine more slowly than younger adults.

Liver function. Since the liver is responsible for converting nicotine to cotinine, any liver impairment slows the process.

Hydration and exercise. While these don’t dramatically speed clearance, staying well-hydrated and physically active supports your body’s natural metabolic processes.

Hormones. Estrogen accelerates nicotine metabolism, which is why women and people on estrogen-containing contraceptives tend to metabolize nicotine faster than men.

A Note on “Detox” Products

Products claiming to rapidly flush nicotine from your system are not supported by scientific evidence. Your liver processes nicotine at its own rate, and no supplement or drink can meaningfully accelerate this. The only reliable way to clear nicotine is to stop using it and wait.

The Bottom Line

For most people, nicotine and cotinine are undetectable in blood and urine within 1–4 days of last use, though heavy users may need up to 2–3 weeks. Hair tests are the exception, with a 90+ day detection window.

If you’re quitting and want to understand the timeline of how your body recovers beyond just nicotine clearance, see our Quit Vaping Timeline and Withdrawal Day by Day guide.

Ready to clear nicotine for good? Find your quit method →