The family that outlasts the others
Volatility is what makes a compound smellable and it is also what makes it leave. The heavier, less volatile aromatic compounds — those associated with wood, camphor, resin and dried fruit — persist far longer than the light floral and green fractions, which is why an aged tea’s aroma is comparatively stable where a fresh one’s is not, and why the aromatic profile of any category drifts towards this family with time whether or not anyone wanted it to. That single fact organises the whole page. A young sheng that reads bitter, brisk and aromatic and an old one that reads of wood, camphor and dried fruit are the same leaf with the light end removed and the heavy end developed; a fresh oolong and a thirty-year-old one stand in the same relation. It also means this family is the least useful for judging freshness and the most useful for judging age, which inverts the diagnostic value of everything in the floral and green pages. A tea that has nothing but this family left has told you where it is in the sequence.
Smoke, and the compounds that carry it
Smoke is the exception in this group because it is almost always applied rather than generated. When wood is burned or smouldered, the lignin in it breaks down into phenolic compounds — guaiacol and syringol and their relatives are the ones usually named — and these are what the nose reads as smoky, tarry, medicinal or bacon-like across every smoked food. Tea takes them up by the same absorption mechanism that scenting relies on, and the resulting character varies with the wood species, its condition, the temperature of the fire and the point in manufacture at which the smoke is applied. Traditional smoked tea from Tongmu is dried over smouldering pine, which gives the resinous, sweet, sappy version of the character. A hotter or dirtier fire gives a sharper, more acrid one. The important distinction for a taster is between smoke that was absorbed and smoke that was added as a flavouring preparation, and the behaviour across infusions separates them: absorbed smoke persists in step with the tea, and an added one front-loads and thins.
Roast smoke, which is not smoke
A genuine and common confusion, and one worth being able to resolve in the cup. Heavy roasting produces phenolic compounds of its own through the browning cascade and through the breakdown of leaf material, so a heavily charcoal-roasted oolong, a dark hojicha and some Korean and Chinese roasted teas can read as smoky without any smoke having touched them. The two are distinguishable with practice. Roast smoke arrives together with the sweetness, body and caramel character that heat generates, and it recedes across infusions to reveal a base underneath. Applied smoke sits more separately, is more phenolic and more medicinal in character, and in the traditional styles carries a distinctly resinous edge that roasting does not produce. There is a third source again, which is a processing fault: scorching during pan-firing or an over-hot roast produces an acrid burnt character that is neither, and which shows on the wet leaf as blackened edges. Three routes to one descriptor, distinguishable by what accompanies it and by what the leaf looks like afterwards.
Camphor, and the vocabulary of aged sheng
Repeated very widely and not evidenced. Recorded because the story is itself part of the culture, not because it happened.
Camphor is a specific and widely used descriptor for well-aged raw pu-erh, naming a cool, penetrating, slightly medicinal quality that is quite unlike anything in a young cake. It sits alongside a related vocabulary — menthol-adjacent coolness, a sensation in the throat, medicinal and herbal notes — and the terms are used consistently enough across the collecting community to function as reliable communication. TeaHQ records the descriptor as a trade convention rather than as a characterised chemical signature, because the accounts that circulate of which compounds produce it are not something the catalogue has verified and because the convention is doing the communicative work regardless. There is also a persistent story that the character comes from camphor trees growing near tea in parts of Yunnan, which circulates widely and which TeaHQ has not found substantiated; it is best reported as a piece of folk explanation rather than as an account of a mechanism. What is not in dispute is that the note is real, that it develops with age, and that its presence is one of the things collectors are paying for.
Wood, and where it comes from without smoke or age
Woody notes appear in three quite different situations. In aged teas they are part of the persistent heavy fraction described above. In some black and oolong teas they arise from carotenoid breakdown, since that route produces woody and violet-adjacent compounds alongside the fruity ones. And in teas made from mature leaf and stem they are associated with the material itself, since older leaf and woody stem carry a different composition from a bud. That third case is why several categories built on mature leaf — some hei cha, coarse bancha, certain aged whites — carry a woody character as a design feature rather than as a sign of anything. Where woody becomes a complaint is when it stands alone: a tea whose aromatics have gone and which reads only of wood and paper has drifted, and the accompanying notes distinguish it. Wood with sweetness and body is a description; wood with a flat cardboard edge and a short finish is a report on the storage, and the lipid oxidation that produces the cardboard note is a separate process from anything on this page.
Medicinal, and the two things it means
Medicinal is used in tea in two opposed registers and readers should know which they are getting. In the aged oolong and aged pu-erh traditions it is a positive descriptor, naming a herbal, camphorous, slightly bitter, resinous quality that indicates maturity and that Chinese tea vocabulary marks with its own terms. In consumer writing it is frequently a euphemism for a tea somebody found unpleasant — harsh, phenolic, chemical or medicinal in the sense of tasting like a remedy. The same word, opposite verdicts. The reliable way to tell them apart is the company it keeps: medicinal alongside camphor, dried fruit, thickness and a long finish is the aged-tea convention, and medicinal alongside thinness, sharpness or a note of plastic or soap is a complaint about a specific fault. That second case is worth taking seriously, since a soapy or chemical note is usually a storage contamination rather than a property of the tea, and it is one of the few descriptors that should send a drinker to look at where the tin has been kept rather than at how they brewed it.