What does cotinine mean?
Cotinine is an organic compound produced naturally in the human body when it metabolises nicotine, the alkaloid found in tobacco. Because the body eliminates cotinine far more slowly than nicotine itself — it typically remains detectable for several days — it serves as the standard biological marker for determining whether someone has smoked, chewed tobacco, used nicotine replacement products, or simply been exposed to second-hand smoke. Clinicians and researchers measure cotinine concentrations in blood, saliva, or urine to verify self-reported smoking status, monitor compliance during cessation programmes, and assess environmental tobacco exposure. The word belongs firmly to medical and scientific registers; lay readers most often encounter it in laboratory reports or public-health studies rather than everyday conversation. Its name, coined in the twentieth century as a rearrangement of the letters of 'nicotine', reflects that close chemical relationship, making the term both precise and memorable within the vocabulary of pharmacology.
nounA white crystalline alkaloid formed in the body as the principal metabolite of nicotine, used biologically as a marker of exposure to tobacco smoke.
- The principal metabolite of nicotine, produced in the liver and measurable in blood, saliva, and urine as a biomarker of tobacco or nicotine exposure.
"The study measured salivary cotinine levels to confirm which participants had been exposed to second-hand smoke."
"Because cotinine remains detectable for days, doctors use it to verify whether a patient has recently smoked."
"Elevated urinary cotinine in non-smokers pointed to regular exposure at their workplace."
Rarely pluralised; the plural appears only in technical contexts referring to distinct measurements, samples, or variants of the compound.
"The assay compared cotinines across all forty urine samples."
Its name is essentially 'nicotine' scrambled — and because cotinine lingers in the body for days after nicotine is gone, it is what truly betrays a smoker.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cotinine
The word cotinine was coined in the mid-twentieth century as an altered form of nicotine, rearranging its letters to name the compound chemically derived from it. Nicotine itself dates to the early nineteenth century, honouring Jean Nicot, the sixteenth-century French ambassador who introduced tobacco to France, combined with the -ine suffix typical of alkaloids. Cotinine therefore shares its ultimate root with related terms such as nicotinic and nicotinamide.
How cotinine is actually used
Strictly technical register, found almost exclusively in medical, toxicological, and scientific writing. It carries no figurative or informal use, and its connotations are neutral-clinical rather than moralising, though in popular health contexts it often appears in discussions of smoking cessation and passive-smoking testing.
Easily confused with cotinine
Nicotine is the addictive alkaloid in tobacco itself, while cotinine is the longer-lasting compound the body produces when it breaks nicotine down.