Nicotine Clearance Calculator

Nicotine itself has a half-life of about 1–2 hours and is typically undetectable in blood within 1–3 days. However, its primary metabolite cotinine persists much longer — up to 3–4 days in blood and up to 7 days in urine for regular users. Hair follicle tests can detect nicotine use for up to 90 days.

Several factors influence nicotine clearance, including your age, weight, biological sex, metabolic rate, kidney and liver health, hydration levels, and how heavily and frequently you use nicotine. Women and people with faster metabolisms tend to clear nicotine more quickly.

Cotinine is the main metabolite produced when your body breaks down nicotine. Because cotinine stays in your system much longer than nicotine itself, most standard drug tests screen for cotinine rather than nicotine. Urine cotinine tests have a typical detection window of 3–7 days for regular smokers.

For light or occasional users, nicotine metabolites can typically be detected in urine for 3–4 days. Heavy, long-term users may test positive for up to 7 days or longer, because cotinine accumulates in body tissues over time and takes longer to fully eliminate.

Not necessarily. Both vaping and smoking introduce nicotine into your bloodstream, and clearance depends on how much nicotine is absorbed, not the delivery method. High-nicotine vape products can produce cotinine levels similar to or exceeding those from cigarettes.

Staying well-hydrated supports kidney function and can modestly increase the urinary excretion of nicotine and cotinine. While water alone won't dramatically shorten detection windows, good hydration combined with physical activity can help your body metabolize nicotine slightly faster.

A calculator like this provides estimates based on established half-life data and population averages. Individual results can vary significantly depending on genetics, liver enzyme activity (especially CYP2A6), medications, and other personal health factors. Use these results as guidance, not a medical guarantee.

Hair follicle tests have the longest detection window — nicotine and cotinine can typically be found in hair for up to 90 days. Since hair grows roughly 1 cm per month, a 3 cm hair sample can reflect nicotine use over the past three months, making hair tests the most comprehensive screening method.