Short answer
Nicotine itself clears within 1–3 days. Cotinine, the metabolite tests actually measure, is typically gone from urine in 3–4 days for occasional users but can persist up to 3 weeks in heavy daily users.
General information, not medical advice. Written from published sources, which are listed at the end. It is not a substitute for a doctor, pharmacist or registered dietitian who knows your situation.
Two different substances get confused here, and the difference is the whole answer. Nicotine leaves fast. Cotinine — what your body turns nicotine into, and what virtually every test measures — lasts far longer.
The two half-lives
| Half-life | What that means | |
|---|---|---|
| Nicotine | ~2 hours | Half is gone within a couple of hours; effectively cleared in 1–3 days. |
| Cotinine | ~20 hours | Ten times more persistent. This is why tests look for it. |
A half-life is the time to clear half of what is present, so full clearance takes roughly five of them. For nicotine that is around ten hours; for cotinine, closer to four days — longer still if you were using heavily, because you started from a higher level.
Detection times by test
| Test | Occasional use | Heavy daily use |
|---|---|---|
| Blood | 1–3 days | Up to 10 days |
| Urine | 3–4 days | Up to 3 weeks |
| Saliva | 1–4 days | Up to 7 days |
| Hair | 1–3 months | Up to 12 months |
What changes your number
- How much and how long. Years of heavy use leave more cotinine to clear than a fortnight of occasional vaping.
- Genetics. The liver enzyme that processes nicotine varies a lot between people, and it is the single largest individual difference.
- Age. Clearance slows somewhat with age.
- Kidney and liver function. Both affect how quickly it leaves.
- Menthol. There is evidence it slows nicotine metabolism modestly.
Detox is not the same as recovery
This is the part worth being clear about. Nicotine being gone from your blood does not mean withdrawal is over. The chemical clears in days; the adjustment takes weeks, because withdrawal comes from your brain readjusting rather than from nicotine still circulating.
So being "clean" on a test at day four while still feeling terrible is completely normal, and is not a sign anything has gone wrong. Cravings peak around day 3 and fade over three to four weeks — well after the last trace of nicotine has gone.
Can you speed it up?
Not in any way that matters. Staying hydrated, sleeping and exercising support normal function, but clearance is governed by liver enzyme activity, which you cannot meaningfully hurry. Products marketed as nicotine detox kits have no good evidence behind them and are not worth the money.
The only variable you control is the date of your last exposure.
