At a glance
| Chemical family | Pyridine alkaloid (tobacco-derived); precursor to tobacco-specific nitrosamines |
| CAS number | 54-11-5 |
| IARC classification | Not classified by IARC as a carcinogen. Documented harms: addiction, cardiovascular effects, developmental/fetal outcomes. The carcinogens of concern in third-hand smoke chemistry are the nitrosamines (NNK, NNN) formed when surface-deposited nicotine reacts with ambient HONO and ozone. |
| Regulatory framework | FDA tobacco product authority (cigarettes, smokeless tobacco, e-cigarettes); state secondhand-smoke restrictions; California Proposition 65 listed for reproductive toxicity. All US EPA pesticide registrations for nicotine were cancelled in the early 2010s after a century of agricultural use. |
| Where you encounter it | Cigarette smoke (mainstream and sidestream), e-cigarette vapor, smokeless tobacco; third-hand surface contamination on walls, fabrics, dust in spaces where any of these have been used; inherited contamination in homes formerly occupied by smokers |
| Sleep micro environment relevance | Concentrates on cotton bedding at NNK:nicotine ratios ~10× higher than the aerosol phase (Schick 2013); passive-samples on cotton pillowcases at concentrations correlating strongly with child urinary cotinine (Quintana 2023); persists on indoor surfaces beyond 50 days, with re-formation of NNK from the deposited nicotine reservoir over months (Whitlatch & Schick 2018, Sleiman 2010) |
| Activated carbon capture | High for vapor-phase nicotine and for the semi-volatile nitrosamines formed from it; limited reach into the soft-furnishing reservoir, where replacement is the more reliable remediation |
Regulatory & certification status
Where Nicotine stands across the major regulatory systems and the certifications a bedroom product might carry. Each row links to the governing instrument; where a jurisdiction has no specific measure, that is stated plainly rather than left blank.
| European Union | Under the EU CLP Regulation (EC) No 1272/2008, nicotine (CAS 54-11-5; EC 200-193-3; Annex VI index 614-001-00-4) carries a harmonised classification as an acute toxicant fatal by the oral, dermal and inhalation routes (Acute Tox. 2, H300/H310/H330) and hazardous to the aquatic environment (Aquatic Chronic 2, H411). The entry includes harmonised acute-toxicity estimate (ATE) values and carries no carcinogenicity, mutagenicity or reproductive-toxicity (CMR) classification. No entry for nicotine was identified on the REACH SVHC Candidate List, the Authorisation List (Annex XIV) or the Restriction List (Annex XVII), and it is not listed under the EU POPs Regulation. Regulatory — ECHA |
| United States | Nicotine is on the California Proposition 65 list as a developmental-toxicity reproductive hazard (listed 01 April 1990, 'Formally Required' mechanism), so consumer exposures can trigger a reproductive-harm warning obligation; it is not Prop 65-listed for cancer. No TSCA risk evaluation or action covering nicotine was identified. Nicotine was formerly registered as a pesticide under FIFRA; EPA issued a product-cancellation order (Federal Register, June 2009) ending its U.S. pesticide registrations, with manufacture of existing stocks permitted only through 31 December 2013 and sale/distribution of existing stocks through 31 December 2014. Regulatory — OEHHA |
| Canada | No CEPA Schedule 1 (List of Toxic Substances) entry for nicotine was identified. Nicotine is regulated in Canada chiefly as a drug / natural health product and, historically, as a pesticide active ingredient under the Pest Control Products Act (administered by Health Canada's PMRA), rather than through the CEPA toxic-substances stream. Regulatory — Government of Canada |
| Australia | Nicotine for human use is controlled under the Poisons Standard (SUSMP) via the TGA: nicotine for human use is generally Schedule 7 (dangerous poison), with carve-outs, and nicotine in vaping products has been a Schedule 4 (prescription) medicine since 1 October 2021 — i.e. it is scheduled as a poison/medicine rather than regulated as an industrial chemical. Agricultural/veterinary nicotine uses fall to the APVMA, not AICIS, and no specific AICIS / IChEMS industrial restriction was identified. Regulatory — TGA · APVMA |
| United Kingdom | Great Britain assimilated the EU harmonised position: the GB Mandatory Classification and Labelling (GB MCL) list classifies nicotine as an acute toxicant fatal by the oral, dermal and inhalation routes (Acute Tox. 2, H300/H310/H330), with no CMR classification. It is administered by HSE as the GB CLP Agency under GB CLP / UK REACH; no UK REACH authorisation or restriction entry for nicotine was identified. Regulatory — HSE |
| Certifications | CertiPUR-US: not addressed — the program tests polyurethane foam for a defined set of chemicals (certain heavy metals, formaldehyde, certain flame retardants, phthalates, ozone depleters, and low VOC emissions) and does not target a plant alkaloid such as nicotine. OEKO-TEX Standard 100: its criteria catalogue regulates pesticide residues on textiles, but no published nicotine-specific limit value was confirmed in its appendices, so coverage cannot be established. GREENGUARD / GREENGUARD Gold: low-VOC chemical-emissions certifications that do not screen for nicotine specifically. Industry — OEKO-TEX |
| The 72-hour test window | Largely missed. Nicotine is a semi-/non-volatile alkaloid (it persists in indoor settings mainly as thirdhand-smoke residue adsorbed onto surfaces, textiles and settled dust) rather than a compound that off-gasses from bedding, so a short ~72-hour VOC chamber emissions test does not reliably capture it; surface-wipe or dust analysis is the appropriate method. Inferred — from the compound's volatility/emission profile versus the VOC focus of short chamber tests |
What it is
Nicotine is a pyridine alkaloid that occurs naturally in the tobacco plant Nicotiana tabacum at 0.6–3.0% by dry weight, depending on cultivar. Chemically, it is a tertiary amine consisting of a pyridine ring linked to a pyrrolidine ring. In tobacco smoke it appears in both vapor and particulate phases; in e-cigarette aerosol it is delivered primarily as nicotine salts dissolved in a propylene glycol or glycerin carrier. The pharmacology — receptor binding at nicotinic acetylcholine receptors, central nervous system stimulation, and the basis of tobacco addiction — is comprehensively reviewed in Benowitz, Hukkanen, and Jacob 2009 in the Handbook of Experimental Pharmacology. Peer-reviewed
Nicotine itself is not classified by IARC as a carcinogen. It is acutely toxic at high doses (LD50 estimates vary widely; the historically cited 60 mg figure for human lethality has been challenged in the literature and the actual lethal dose is meaningfully higher). Its established harms at chronic exposure are addiction, cardiovascular effects including increased heart rate and blood pressure, vascular endothelial dysfunction, and well-documented developmental and fetal outcomes when exposure occurs during pregnancy. The reason it appears in this Atlas is not its own pharmacology. It is the chemistry it undergoes once it leaves the body and lands on a surface.
That chemistry — established by Sleiman, Gundel, Pankow, Jacob, Singer, and Destaillats 2010 in the Proceedings of the National Academy of Sciences — is the reaction of surface-deposited nicotine with ambient nitrous acid (HONO) to form tobacco-specific nitrosamines including NNK, which IARC classifies as Group 1 (carcinogenic to humans). Independent work has confirmed parallel ozone-driven oxidation pathways on indoor surfaces. The implication is unusual in indoor environmental chemistry: the surface is not just collecting a deposited compound; it is actively generating new, more carcinogenic compounds from the deposited material, on a timescale of days to weeks, for as long as the deposited nicotine reservoir remains. Peer-reviewed
How it gets to the bedroom
From combustion tobacco smoke
Direct cigarette, cigar, or pipe smoke in or near the bedroom deposits nicotine on every surface — walls, fabrics, dust, mattress and pillow surfaces. The deposition is non-uniform: porous high-surface-area materials (cotton fibers, foam, ceiling tiles, carpet) accumulate more than smooth surfaces (glass, polished metal, sealed paint).
From e-cigarette and vaping aerosol
Bush and Goniewicz 2015, in a pilot study in the International Journal of Drug Policy, measured surface nicotine in the homes of electronic cigarette users, tobacco smokers, and non-users of nicotine products. They found measurable surface nicotine in e-cigarette user homes — lower than in combustible-tobacco households but well above non-user baselines. The third-hand vapor pathway is documented, even if less intensively studied than third-hand combustion smoke. The same surface chemistry that converts nicotine to nitrosamines operates regardless of whether the nicotine arrived as smoke or as vapor. Peer-reviewed
From inherited contamination
Moving into a former smoker's home is one of the most consequential exposure scenarios documented in the third-hand smoke literature. Matt et al. 2017, in Tobacco Control, measured the homes of former smokers six months after smoking cessation and found persistent surface nicotine and dust NNK throughout. Matt et al. 2020 in Preventive Medicine Reports went further: they documented surface nicotine in approximately 10% of nonsmoker apartments at levels exceeding average smoker homes from previous studies — legacy contamination persisting across tenancy changes in multiunit housing for years. Peer-reviewed
From cotton fiber concentration
The bedding-specific finding that makes nicotine consequential for sleep environments comes from Schick et al. 2013, in Tobacco Control. In controlled chamber experiments, cotton cloth exposed to tobacco smoke accumulated NNK at a NNK:nicotine ratio approximately 10× higher than the aerosol phase. Cotton — the dominant fiber in sheets, pillowcases, and many mattress covers — preferentially concentrates the most carcinogenic fraction of the smoke. This is not a peripheral finding about wall surfaces. It is a finding about the textiles pressed against a sleeping body for eight hours a night. Peer-reviewed
What the research says
Documented surface chemistry
Sleiman et al. 2010 demonstrated that nicotine adsorbed onto indoor materials reacts with ambient HONO to form NNK and other tobacco-specific nitrosamines, with NNK formation observed within hours of HONO exposure and continuing as long as both the deposited nicotine and ambient HONO were available. The reaction is surface-mediated; it does not proceed in clean air under the same conditions. The implication is that the room is generating new Group 1 carcinogen from the existing nicotine reservoir, in a building-air-quality regime where HONO is routinely present from combustion sources, NOx chemistry, and outdoor infiltration. Peer-reviewed
Long-term surface persistence has been quantified directly. Whitlatch and Schick 2018, in Nicotine & Tobacco Research, reanalyzed previously unpublished Philip Morris research from 1991 archived in the tobacco industry document repositories. The original experiments tracked surface contamination from cigarette smoke over more than 100 days. Whitlatch and Schick confirmed surface nicotine and tobacco-specific nitrosamine persistence beyond 50 days after smoking ended, with NNK concentrations 110 days post-exposure that could exceed the mass of NNK that entered the room as smoke. The room continued to generate new carcinogen on the surfaces long after the smoke itself had cleared. Peer-reviewed
Documented exposure to occupants
Quintana et al. 2023, in the Journal of Environmental Exposure Assessment, deployed cotton pillows as passive samplers in 35 children's homes with mixed smoking exposure. The pillowcase nicotine measured in those homes correlated strongly with both air nicotine (Spearman rho 0.76–0.88) and with child urinary cotinine (rho 0.65–0.81, all p < 0.001). The child's pillow was functioning as a passive sampler of the home's tobacco-smoke chemistry, and the child's urinary cotinine confirmed that the deposited nicotine was producing real internal dose. Peer-reviewed
Bahl et al. 2014 in PLOS ONE quantified the developmental dermal exposure: toddlers received approximately 6.8× and infants approximately 24× the adult-equivalent dermal dose from contact with contaminated fabric. The disparity is driven by surface-area-to-body-mass ratio, hand-to-mouth behavior, and time spent on floors and beds where dust accumulates. Even with thorough cleaning of laundered fabric, residual tobacco-specific nitrosamines were detectable on fabric 19 months after exposure. Peer-reviewed
Documented genotoxicity from the secondary products
Hang et al. 2013, in Mutagenesis, demonstrated that third-hand smoke extracts cause DNA damage in human cells — single-strand and double-strand breaks — at doses consistent with realistic environmental exposures. The genotoxicity is not coming from nicotine itself; it is coming from the nitrosamines and other reaction products that form from it on surfaces. Peer-reviewed
What helps reduce exposure
Tier 1 — most effective. Eliminate active smoking and vaping in the bedroom and in rooms sharing air with the bedroom. For inherited contamination from previous occupants, replacement of high-affinity soft furnishings — mattresses, pillows, upholstered furniture, carpet — is the most evidence-supported remediation. Hard-surface cleaning and laundering address part of the problem; the foam-core reservoir inside pillows and mattresses cannot be cleaned and continues to feed the surface chemistry.
Tier 2 — worth considering. Launder bedding multiple cycles in hot water; a single cycle removes a fraction of the surface-bound contamination, not the foam-core reservoir. Repaint walls with a sealing primer first to reduce wall-surface reservoirs. Replace carpet and especially carpet underlay (a persistent third-hand smoke reservoir). For air-quality concerns during the cleanup window, HEPA + activated carbon filtration helps in real time, with the caveat that surface cleaning addresses the longer-tail reservoir that re-emits over weeks. See the flagship article The Smoke That Stays for the full surface-cleaning-vs-air-cleaning evidence.
Tier 3 — larger interventions. Professional third-hand smoke remediation services exist for severe contamination; cost and effectiveness vary widely, and the willingness to replace soft furnishings is the dominant determinant of outcome. For pregnant women, parents of infants, and immunocompromised individuals, the public health literature generally recommends remediation to a measured baseline before occupancy in heavily contaminated environments.
What does NOT help
Air fresheners and ozone generators do not address surface chemistry. Fragrance products mask odor while adding their own indoor air burden. Ozone generators can react with surface-deposited nicotine to form additional irritant and carbonyl byproducts; the EPA does not recommend ozone generators for indoor air quality remediation.
"The smell is gone" is not "the chemistry is gone." Olfactory adaptation and decline of the most volatile odor compounds happens within months. The semi-volatile, surface-bound nicotine — and the nitrosamines formed from it — persist far longer than the perceptible smoke odor.
A single wash does not reset the fabric. Bahl et al. 2014 detected residual tobacco-specific nitrosamines on fabric 19 months after exposure despite washing. Multiple cycles help; items that cannot be effectively laundered (mattresses, pillows, upholstered furniture) remain the dominant reservoir regardless of how the linens are cleaned.
Surface cleaning alone leaves the foam-core reservoir intact. Wiping down hard surfaces helps reduce the surface concentration that re-emits. The mattress, the pillow shell, and the upholstered headboard remain reservoirs unless replaced.
Open research questions
- The contribution of e-cigarette and vaping aerosol to long-term third-hand surface reservoirs has been documented at the proof-of-concept level (Bush & Goniewicz 2015) but not characterized across vaping devices, e-liquid formulations, and use intensities. Spec
- The dose-response relationship between surface nicotine concentration on bedding and quantified health outcomes in healthy adults at residential exposure levels is not yet established. Mechanism is documented; magnitude of effect at bedroom doses is an active research area. Inferred
- Whether nicotine-targeted remediation chemistry (sealing primers, specific cleaning agents) can durably reduce the surface reservoir on textiles to baseline has not been characterized in controlled head-to-head studies. Spec
Citations
- Sleiman M, Gundel LA, Pankow JF, Jacob P III, Singer BC, Destaillats H. Formation of carcinogens indoors by surface-mediated reactions of nicotine with nitrous acid, leading to potential thirdhand smoke hazards. PNAS. 2010;107(15):6576-6581. doi:10.1073/pnas.0912820107 Peer-reviewed
- Schick SF et al. Thirdhand cigarette smoke in an experimental chamber: evidence of surface deposition of nicotine, nitrosamines and polycyclic aromatic hydrocarbons and de novo formation of NNK. Tobacco Control. 2014;23:152-159. doi:10.1136/tobaccocontrol-2012-050915 Peer-reviewed
- Matt GE et al. When smokers quit: exposure to nicotine and carcinogens persists from thirdhand smoke pollution. Tobacco Control. 2017;26:548-556. doi:10.1136/tobaccocontrol-2016-053119 Peer-reviewed
- Matt GE et al. Persistent tobacco smoke residue in multiunit housing: Legacy of permissive indoor smoking policies. Preventive Medicine Reports. 2020;18:101088. doi:10.1016/j.pmedr.2020.101088 Peer-reviewed
- Quintana PJE et al. Cotton pillow samplers for assessment of thirdhand smoke in homes of smokers and nonsmokers with children. Journal of Environmental Exposure Assessment. 2023;2:23. doi:10.20517/evcna.2023.34 Peer-reviewed
- Bahl V, Jacob P III, Havel C, Schick SF, Talbot P. Thirdhand Cigarette Smoke: Factors Affecting Exposure and Remediation. PLOS ONE. 2014;9(10):e108258. doi:10.1371/journal.pone.0108258 Peer-reviewed
- Hang B et al. Thirdhand smoke causes DNA damage in human cells. Mutagenesis. 2013;28(4):381-391. doi:10.1093/mutage/get013 Peer-reviewed
- Benowitz NL, Hukkanen J, Jacob P III. Nicotine chemistry, metabolism, kinetics and biomarkers. Handbook of Experimental Pharmacology. 2009;192:29-60. doi:10.1007/978-3-540-69248-5_2 Peer-reviewed
- Bush D, Goniewicz ML. A pilot study on nicotine residues in houses of electronic cigarette users, tobacco smokers, and non-users of nicotine-containing products. International Journal of Drug Policy. 2015;26:609-611. doi:10.1016/j.drugpo.2015.03.003 Peer-reviewed
- Whitlatch A, Schick SF. Thirdhand Smoke at Philip Morris. Nicotine & Tobacco Research. 2019;21(12):1680-1688. doi:10.1093/ntr/nty153 Peer-reviewed
Frequently asked questions
Is nicotine itself a carcinogen?
No. Nicotine is not classified by IARC as a carcinogen. Its documented harms are addiction, cardiovascular effects, and developmental/fetal outcomes. What makes surface-deposited nicotine consequential in third-hand smoke chemistry is that it reacts with ambient nitrous acid (HONO) and ozone on indoor surfaces to form tobacco-specific nitrosamines — NNK and NNN — which are IARC Group 1 carcinogens. Nicotine is the precursor; the products of its surface chemistry are the carcinogens.
How long does nicotine persist on indoor surfaces?
Months to years. Whitlatch and Schick 2018 documented nicotine and NNK persisting on indoor materials beyond 50 days after exposure ended, with surface NNK concentrations 110 days post-exposure that could exceed the mass of NNK that entered the room as smoke. Matt et al. 2020 detected surface nicotine in nonsmoker apartments at levels exceeding average smoker homes from previous studies — legacy contamination can persist across tenancy changes in multiunit housing for years.
Does washing bedding remove deposited nicotine?
Laundering reduces surface nicotine but does not eliminate it, and it does not address the foam core inside pillows and mattresses. Schick et al. 2013 demonstrated that cotton cloth preferentially accumulates the most carcinogenic fraction of tobacco smoke at a NNK:nicotine ratio approximately 10× higher than the aerosol phase. Bahl et al. 2014 documented residual tobacco-specific nitrosamines on fabric 19 months after exposure despite washing. Multiple cycles help; for heavily contaminated soft furnishings, replacement is the most reliable remediation.
Does e-cigarette vapor leave third-hand residue too?
Yes. Bush and Goniewicz 2015 measured surface nicotine residues in the homes of electronic cigarette users, tobacco smokers, and non-users, and found measurable nicotine on indoor surfaces in e-cigarette user homes. The concentrations were lower than in combustible-tobacco households but non-zero — and the same surface chemistry that converts nicotine to nitrosamines applies regardless of whether the nicotine arrived from combustion or vaporization.
Is nicotine still a registered pesticide?
No. Nicotine had been used as a contact insecticide in agriculture for over a century, but the US Environmental Protection Agency cancelled all remaining nicotine pesticide registrations in the early 2010s. The current regulatory framework for nicotine is the FDA tobacco-product authority (cigarettes, smokeless tobacco, e-cigarettes) and state-level secondhand smoke restrictions, not pesticide registration.
How is third-hand smoke exposure actually measured?
The standard approach combines surface nicotine measurement with urinary cotinine in the exposed person. Quintana et al. 2023 deployed cotton pillows as passive samplers in 35 children's homes and found pillowcase nicotine correlated strongly with air nicotine (rho 0.76–0.88) and with child urinary cotinine (rho 0.65–0.81). The pillow is functioning as a passive sampler whether the household designed it to or not — and the child's urinary cotinine confirms that the surface chemistry is producing real biological dose.
Can I take my baby into a home where someone used to smoke?
The peer-reviewed evidence supports caution. Bahl et al. 2014 measured dermal exposure from contaminated fabric and found toddlers received approximately 6.8× and infants approximately 24× the adult-equivalent dose, driven by surface-area-to-body-mass ratio, hand-to-mouth contact, and time spent on floors and beds where dust accumulates. The chemistry continues even when no one is currently smoking. Discuss specific decisions with your pediatrician; for environmental decisions in former-smoker homes, replacement of soft furnishings used by infants is the most evidence-supported action.
Related compounds
This page describes documented chemistry and exposure pathways. It does not provide medical advice. Anyone concerned about third-hand smoke exposure in their environment should consult appropriate professional remediation guidance and their healthcare provider for personal medical decisions.
Last reviewed May 31, 2026.