NNK
chemical compound
Nicotine-derived nitrosamine ketone (NNK) is one of the key tobacco-specific nitrosamines (TSNAs) derived from nicotine. It plays an important role in carcinogenesis. The conversion of nicotine to NNK entails opening of the pyrrolidine ring.
Synthesis and occurrence
NNK can be produced by standard methods of organic synthesis.
Tobacco
NNK is both found in cured tobacco and produced during its burning (pyrolysis). The amount delivered in cigarette smoke ranged from 30 to 280 ng per cigarette in one study and 12 to 110 ng per cigarette in another.
Sun-cured ("Oriental") tobaccos contain very little NNK and other TSNAs due to being grown in low-nitrate soil, lack of nitrate fertilizer, and sun-curing. Flue-cured tobacco ("Virginia" tobacco), especially when cured using an open flame, contains most of the NNK in American blended tobaccos, although Marlboro's "Virginia blend" had the lowest levels of NNK per nicotine out of many tested, with the exception of Natural American Spirit.
e-Cigarettes
e-Cigarettes do not convert nicotine to NNK due to their lower operating temperatures. The amount of NNK delivered by e-cigarettes reaches 2.8 ng per 15 puffs (approximately 1 cigarette).
The public source identifies “NNK” as chemical compound. This brief keeps that definition visible, then builds a research path around chemical and compound.
Why this record matters
A short description can identify a subject without explaining its stakes. For “NNK”, the useful work is to connect “chemical compound” to the records capable of establishing context and consequence.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Sep 18, 2026. The linked authority identifier is Q6138931. None of the 0 selected statements returned an explicit reference.
A general summary may omit uncertainty, sample limits or methodological disagreement that is explicit in the technical record. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Check terminology, classification and the date of the cited evidence. Scientific names and technical consensus can change while older records retain historical value.
- Current terminology
- Classification context
- Finding cited technical literature
Primary datasets, specimen catalogues, standards bodies and the most recent peer-reviewed literature.
Three-step research path
- Establish the record: confirm the title “NNK”, its source revision and the description used here.
- Expand the search: follow NNK primary sources, NNK archive and chemical research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “NNK”?
- Has classification or technical consensus changed since the cited source?
- Which observation, specimen, dataset or publication supports the account?
Search terms from this dossier
This entry incorporates text from “NNK” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.