Cotinine is typically detectable in urine for up to 3 to 4 days after your last exposure to nicotine, though heavy or long-term users may test positive for up to 7 days. The exact window depends on how much and how often you used nicotine, your individual metabolism, and the sensitivity of the test being used.
Why Tests Look for Cotinine, Not Nicotine
When nicotine enters your body, your liver breaks it down into several byproducts. The primary one is cotinine, which sticks around much longer than nicotine itself. Nicotine has a half-life of only 2 to 3 hours, meaning half of it leaves your bloodstream in that time. Cotinine’s half-life is 15 to 19 hours, with some estimates ranging from 12 to 40 hours depending on the person. That longer presence in the body makes cotinine a far more reliable marker for detecting recent nicotine use, which is why nearly all urine screening tests target it instead of nicotine directly.
Detection Times by Usage Level
For occasional or light nicotine users, cotinine generally clears from urine within 3 to 4 days after the last exposure. If you smoked a single cigarette at a party or used a nicotine pouch once, you’re looking at the shorter end of that window.
For daily or heavy users, cotinine can remain detectable for up to 7 days. The body accumulates higher baseline levels of cotinine when nicotine is consumed repeatedly throughout the day, so there’s simply more of it to clear. On top of that, a further breakdown product of cotinine can persist in urine for weeks after someone stops heavy, long-term nicotine use. Whether a test picks up that secondary metabolite depends on what the lab is specifically screening for, but some panels do include it.
What Counts as a Positive Result
Urine cotinine tests aren’t just checking whether any cotinine is present. They measure the concentration and compare it against a cutoff threshold. The most common cutoff used to distinguish tobacco users from non-users is 200 ng/mL, though some tests use a much lower threshold of 10 ng/mL. That lower cutoff can detect light exposure, including secondhand smoke, while the 200 ng/mL cutoff is designed to identify active tobacco or nicotine product users.
Which cutoff applies to you depends on who ordered the test. Life insurance companies, employers, and healthcare providers may use different thresholds. A test with a 10 ng/mL cutoff will naturally produce a longer effective detection window than one set at 200 ng/mL, because it can catch lower concentrations as your body finishes clearing the cotinine.
Factors That Speed Up or Slow Down Clearance
The 3-to-7-day range is a general guide, but individual biology creates real variation. Several factors influence how quickly your kidneys filter cotinine out of your system.
- Genetics: Research published in Thorax found that the renal clearance of cotinine varies considerably between individuals, with much of that variation driven by inherited differences in how the kidneys actively secrete the compound. Some people are simply wired to clear it faster than others.
- Kidney function: Cotinine leaves the body through the kidneys. Reduced kidney function slows the process, potentially extending the detection window.
- Hydration and urine pH: In most people, the kidneys tend to reabsorb some cotinine rather than excrete it, and this process is influenced by urine acidity. More acidic urine generally promotes faster excretion, while alkaline urine can slow it down.
- Age and metabolism: Older adults and people with slower metabolic rates tend to process cotinine more slowly, which can add time to the detection window.
Vaping, Patches, and Other Nicotine Sources
Cotinine is a marker of nicotine exposure regardless of the source. Cigarettes, e-cigarettes, nicotine gum, patches, pouches, and even significant secondhand smoke exposure all produce cotinine in your urine. The detection window is driven by how much nicotine you absorbed, not by the delivery method. A heavy vaper who uses high-nicotine e-liquid will have a detection timeline similar to a heavy cigarette smoker.
Standard cotinine tests cannot distinguish between smoking and vaping. Newer lab assays are being developed that pair cotinine with a separate biomarker specific to combustible smoke, allowing researchers to tell whether someone smoked, vaped, or both. But these are not yet part of routine screening. For the urine test you’re likely facing, all nicotine sources look the same.
Common Testing Scenarios
Life insurance applications are one of the most common reasons people encounter cotinine urine tests. Insurers typically classify anyone who tests positive as a tobacco user, which can significantly increase premiums. The detection window they’re working with is the same: roughly 3 to 4 days for light users, up to a week for heavy users.
Pre-employment and workplace wellness screenings also use cotinine urine tests, particularly in healthcare settings and companies that offer non-smoker insurance discounts. Surgical programs sometimes screen patients before elective procedures because nicotine use affects wound healing and anesthesia risk. In all of these cases, the same general timeline applies. If you’ve stopped all nicotine products for at least 7 to 10 days and were not a decades-long heavy smoker, cotinine will typically have fallen below standard cutoff levels.