# Why everything tastes the same: the evidence that commercial cannabis is converging

> Growers keep saying modern weed all tastes the same, and the data back them up. A study of nearly 90,000 US lab results found THC-dominant flower falling into just three terpene groups, two of which held about 87 % of samples. Strain names and indica/sativa labels promise far more variety than the chemistry shows, traditional landraces in their home regions are being replaced by introduced hybrids, and retail prices rise with THC rather than aroma. GenetixBay's answer is preservation, documentation with GB-IDs, and open sharing of distinctive lines.

- Canonical: https://genetixbay.com/knowledge/genetics-history/why-everything-tastes-the-same.html
- Category: Genetics history · Level: Intermediate
- Evidence: Supported · Status: Draft: awaiting expert review (some figures are being checked)
- Stage: Any stage · Systems: Any system
- Updated: 2026-10-31 · Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay Knowledge Base (genetixbay.com/knowledge)"

## Questions and answers

**Why does all modern weed taste the same?** Modern weed tastes the same because commercial cannabis really is converging chemically. In nearly 90,000 lab results from six US states, THC-dominant flower fell into three [terpene](https://genetixbay.com/knowledge/glossary/terpene.md) groups, and caryophyllene-limonene and myrcene-pinene held about 87% of samples. Breeders reuse the same few popular parents, the market pays for [THC](https://genetixbay.com/knowledge/glossary/thc.md) rather than aroma, and [landraces](https://genetixbay.com/knowledge/glossary/landrace.md) are being hybridised away.

**Are strains losing their diversity?** Commercial strains do appear to be losing diversity, though nobody has measured genetic diversity over time directly. Cross-sectional data show thousands of names on a few terpene groups and broad genetic clusters, and landraces are endangered by hybrid replacement at source. Diversity is not gone: terpinolene-led and rarer profiles and documented heirloom lines still circulate.

**What are the main [terpene profiles](https://genetixbay.com/knowledge/glossary/terpene-profile.md) in cannabis?** The main terpene profiles in commercial THC-dominant cannabis are three groups found in a 2022 study of US lab data: caryophyllene-limonene, myrcene-pinene, and terpinolene-myrcene. The first two held 87.4% of samples, and terpinolene-led flower is the smallest group, around an eighth. Rarer dominants include ocimene and the sesquiterpene alcohols guaiol and eudesmols, linked to some Central Asian lines.

**Are landrace strains disappearing?** Landrace strains are disappearing in their home regions. Taxonomists describe traditional high-THC domesticates as endangered, with 50 years of [introgressive hybridisation](https://genetixbay.com/knowledge/glossary/introgression.md) having obliterated differences between them. In Morocco's Rif, traditional kif has largely been replaced by introduced high-yielding hybrids. Similar replacement is widely reported elsewhere, though less systematically documented.

**Why does the market breed for THC instead of flavour?** The market breeds for THC instead of flavour because price follows THC. In about 30 million Washington State flower sales, price per gram rose with THC content, and labels, lab results and shelf placement lead with a THC number. When buyers pay for potency, breeders select for it. That is a price signal at work, not anyone's plan.

**How can I find cannabis with a different terpene profile?** To find cannabis with a different terpene profile, read the terpene section of the [certificate of analysis](https://genetixbay.com/knowledge/glossary/coa.md), not just THC, and look for less common dominants such as [terpinolene](https://genetixbay.com/knowledge/glossary/terpinolene.md), ocimene, or high guaiol and eudesmols. Grow heirloom and landrace seed with documented history and pheno-hunt for aroma, keeping odd incense or pine keepers even if they are not trending.

**What makes cannabis smell like gas?** Cannabis smells like gas mostly because of prenylated [volatile sulfur compounds](https://genetixbay.com/knowledge/glossary/volatile-sulfur-compounds.md), not terpenes. A 2021 study found seven across 13 cultivars; the key one, [3-methyl-2-butene-1-thiol](https://genetixbay.com/knowledge/glossary/prenylthiol.md), was most abundant in the most pungent samples and recreated the fuel-like smell when added to a base aroma mix. These compounds rise towards the end of flower, peak during curing, and are detected at tiny traces.

**Why is every new strain gas or [candy](https://genetixbay.com/knowledge/glossary/candy-terps.md)?** Every new strain seems to be gas or candy because the market rewards loud aromas, so breeders cross loud to loud. Consumers rated citrus-sweet-pungent samples as more potent and valuable, though perceived potency did not track measured THC. Those notes ride on trace [sulfur](https://genetixbay.com/knowledge/glossary/sulfur.md) compounds and esters over the same few terpene backbones, so popular cuts keep parenting the next wave.

**Are the classic strains disappearing?** Classic profiles such as incense, hash, pine and old haze are losing ground, in GenetixBay's house view, because the gas and candy trend crowds them out. Nobody bans a classic; it simply stops being crossed and stocked. Terpinolene-led flower is already the smallest commercial group. Menu share by aroma has not been measured, so preserving and sharing classic cuts, seed and males matters.

**Short answer.** It isn't just nostalgia. In nearly 90,000 lab results from six US states, THC-dominant flower fell into **three terpene groups**, and two of them (caryophyllene–[limonene](https://genetixbay.com/knowledge/glossary/limonene.md) and [myrcene](https://genetixbay.com/knowledge/glossary/myrcene.md)–pinene) held about **87 %** of samples with terpene data [1]. Thousands of strain names sit on top of that narrow chemistry [1][3]. Meanwhile the traditional landraces that once supplied distinct profiles are being hybridised away in their home regions [6][7], and retail prices rise with THC, not aroma [9]. The evidence shows convergence. GenetixBay's answer is to preserve, document and share what's distinctive.

> **House position, carefully framed.** The founder's view, after growing thousands of cultivars, is that modern commercial lines are converging, distinctive old profiles are being bred out, and the best is kept by a few. We don't claim a plot. The data below show convergence driven by ordinary forces: everyone breeding from the same few popular parents, the market paying for THC, and landraces disappearing at source. Those are things a community can do something about.

## What the data show

| Study | What they measured | Finding |
|---|---|---|
| Smith et al. 2022 [1] | 89,923 flower lab results, six US states; 42,843 with terpenes | **96.5 %** THC-dominant. THC-dominant samples clustered into three terpene groups: I caryophyllene–limonene, II myrcene–pinene, III terpinolene–myrcene. Groups I and II held **87.4 %**. Commercial labels matched chemistry poorly |
| Reimann-Philipp et al. 2020 [3] | Nevada medical cannabis, chemistry and genetic markers | Hundreds of strain names, but terpene profiles fell into a few clusters: names "misrepresent" the real diversity |
| Watts et al. 2021 [2] | Genomes and chemistry of retail samples | "Indica" and "sativa" labels were genetically indistinct genome-wide; only a few terpenes tracked the labels |
| Schwabe & McGlaughlin 2019 [11] | Same-named strains from dispensaries in three states | Most named strains had genetic outliers; names don't guarantee a distinct [genotype](https://genetixbay.com/knowledge/glossary/genotype.md) |
| Lynch et al. 2016; Sawler et al. 2015 [4][5] | Genotypes of hundreds of drug-type varieties | A few broad genetic groups underlie the drug-type market, and reported ancestry only partly matches genotype | (2020) from the full text; we haven't found a study that measures commercial genetic diversity directly over time.

## Why it's happening

**1. Everyone breeds from the same parents.** Modern drug-type cannabis is a hybrid swarm built from a limited set of founders, and popular lines get crossed with each other repeatedly (see [how hybrid strains emerged](https://genetixbay.com/knowledge/genetics-history/how-hybrid-strains-emerged.md)). The genetic groups found in commercial samples are few and broad [4][5].

**2. The market pays for THC.** In about 30 million Washington State flower sales, price per gram rose with THC content [9]. Labels, lab results and shelf placement lead with a THC number. When buyers pay for THC, breeders select for it, and aroma diversity isn't what gets selected.

**3. Landraces are disappearing at source.** McPartland and Small describe the high-THC domesticates as **endangered**: 50 years of introgressive hybridisation "obliterated differences" between them [6]. In Morocco's Rif, traditional kif has largely been replaced by introduced high-yielding hybrids [7]. Similar replacement is widely reported elsewhere [8], though documented less systematically.

**4. Names hide the sameness.** With thousands of names and few chemotypes, the shelf looks diverse when it isn't [1][3][10]. A new name is easier to produce than a new terpene profile.

## What the data don't show

- **Not that diversity is gone.** Cluster III (terpinolene-led) and rarer profiles exist [1]; heirloom and landrace lines still circulate.
- **Not who is hoarding what.** "The best is kept by a few" is the founder's experience, not something these studies measure. We present it as his view.
- **Not that THC selection is anyone's plan.** It's what a price signal does.

## The gas and candy trend

> **House position: the gas and candy trend is killing the classics.** The founder's view, and GenetixBay's: market selection for "gas" and "candy" is crowding out the old profiles (incense, hash, pine, haze). Below is what the chemistry shows about those two trends and why they narrow the pool. How fast the classics are losing shelf space hasn't been measured; that part is the founder's experience.

**What "gas" is, chemically.** The skunky, fuel-like note that buyers call gas comes mostly from a family of **prenylated volatile sulfur compounds**, not from terpenes. Oswald and colleagues found seven of them across 13 cultivars; the key one, 3-methyl-2-butene-1-thiol (labelled VSC3), was the most abundant sulfur compound in the samples a panel rated most pungent, and adding it to a mix of major cannabis aroma compounds recreated the characteristic smell [12]. These compounds rose sharply towards the end of flower, peaked during curing and then fell off in storage [12]. Sulfur compounds are smelled at tiny concentrations, so a trace of them dominates a jar.

**What "candy" and "tropical" are.** A follow-up study of 31 rosin samples found that the sweet, fruity, "exotic" aromas track **minor, non-terpene compounds**: esters, and a class of tropical sulfur compounds built on a 3-mercaptohexyl group (3-mercaptohexanol, 3-mercaptohexyl acetate and 3-mercaptohexyl butyrate), the same family that gives some hops and tropical fruit their character [13]. Savoury "chemical" notes tracked skatole [13]. The key line: terpene profiles were "remarkably similar" across varieties whose aromas differed sharply, and terpenes contributed mainly to the generic cannabis smell, not to what made each variety distinctive [13].

**Why that narrows the pool.**

1. **The backbone stays the same.** If the "new" aromas ride on trace compounds, a menu of candy and gas cuts can sit on the same couple of terpene backbones the lab data already show: caryophyllene–limonene and myrcene–pinene, with 87 % of THC-dominant samples between them [1]. Different top notes; same underlying chemistry, often the same few parents (see [same cut, a thousand names](https://genetixbay.com/knowledge/genetics-history/same-cut-a-thousand-names.md)).
2. **The market rewards loud.** When consumers rated strains by smell, citrus-sweet-pungent samples were judged more potent and worth more per gram than earthy-woody ones, yet perceived potency didn't correlate with measured THC at all [14]. Loud sells, so breeders cross loud to loud, and every popular gas or dessert cut becomes the parent of the next wave.
3. **The classics lose by default.** Incense, hash, pine and old haze profiles are mostly earthy, woody, spicy or terpinolene-led. Terpinolene-dominant flower is already the smallest of the three commercial groups, around an eighth of THC-dominant samples [1]. Nobody bans a classic; it just stops being crossed, stops being stocked, and survives only where someone keeps it.

**What the data don't show.** No study we've found counts menu share by aroma type over time, so "dessert and candy crosses dominate menus" is a widely shared observation, including the founder's, not a measured trend. Nor does the chemistry say gas or candy is bad. They're real, interesting compounds. The problem is a market that selects for them at the expense of everything else.

**What to do about it.** Keep and share the classic profiles (cuts, seed, males in [the Stud Book](https://genetixbay.com/knowledge/glossary/stud-book.md)), describe aroma on [GB-ID](https://genetixbay.com/knowledge/glossary/gb-id.md) records in words and chemistry, and when you hunt, keep the odd incense or pine keeper even if it isn't what's trending.

## What GenetixBay does about it

- **Preserve.** Wanted-line and revival programmes, clone backups, males in the Stud Book, seed vaults (see [landraces of the world](https://genetixbay.com/knowledge/genetics-history/landraces-of-the-world.md) and [clone-only preservation](https://genetixbay.com/knowledge/breeding/clone-only-preservation.md)).
- **Document chemistry, not names.** GB-IDs carry lab-tested terpene profiles, so a distinctive line can be found by what it is, not what it's called (see [chemotype inheritance](https://genetixbay.com/knowledge/breeding/chemotype-inheritance.md)).
- **Reward aroma, not just THC.** On the Bay, potency numbers never earn rewards by themselves; documentation, males and preservation do.
- **Share openly.** Distinctive lines registered, described and shared in legal lanes stay in the commons (see [patents and the gene pool](https://genetixbay.com/knowledge/genetics-history/patents-and-the-gene-pool.md)).

## For growers: finding something different

1. Ask for the certificate of analysis and read the **terpene** section, not just THC.
2. Look for the less common dominants: terpinolene, ocimene, or high levels of guaiol and eudesmols (associated with some Central Asian lines [2][6]).
3. Grow heirloom and landrace seed with a documented history, and pheno-hunt for aroma (see [selection and pheno-hunting](https://genetixbay.com/knowledge/breeding/selection-pheno-hunting.md)).

## Evidence

- Commercial THC-dominant flower clustering into a few terpene groups: *Supported* by large lab datasets [1][3].
- Labels and names misrepresenting diversity: *Supported* [1][2][3][11].
- Landrace erosion by hybridisation: *Supported* [6][7]; extent outside Morocco less documented.
- Price tracking THC: *Supported* in one large market [9].
- "The best is hoarded by a few": founder's view, not measured.
- "Gas" aroma driven by prenylated volatile sulfur compounds (VSC3): *Supported* by one detailed study [12].
- Candy/tropical aromas driven by minor non-terpene compounds, with terpene profiles similar across divergent aromas: *Supported* by one study of 31 extracts [13].
- Consumers rating loud, sweet-pungent flower as more potent and valuable without any link to measured THC: *Supported* [14].
- The gas/candy trend crowding out classic profiles: house position (founder's view); menu share by aroma type not yet measured.

## Quick answers

- [What are terpenes in cannabis?](https://genetixbay.com/knowledge/answers/what-are-terpenes.md): Terpenes are the volatile aroma compounds cannabis makes in its glandular trichomes, alongside cannabinoids; myrcene, limonene, caryophyllene, pinene and terpinolene are common.

## Sources

1. Smith CJ, Vergara D, Keegan B, Jikomes N. 2022. The phytochemical diversity of commercial Cannabis in the United States. PLOS ONE 17(5):e0267498. https://doi.org/10.1371/journal.pone.0267498
2. Watts S, McElroy M, Migicovsky Z, et al. 2021. Cannabis labelling is associated with genetic variation in terpene synthase genes. Nature Plants 7:1330-1334. https://doi.org/10.1038/s41477-021-01003-y
3. Reimann-Philipp U, Speck M, Orser C, et al. 2020. Cannabis chemovar nomenclature misrepresents chemical and genetic diversity; survey of variations in chemical profiles and genetic markers in Nevada medical cannabis samples. Cannabis and Cannabinoid Research 5(3):215-230. https://doi.org/10.1089/can.2018.0063
4. Lynch RC, Vergara D, Tittes S, et al. 2016. Genomic and chemical diversity in Cannabis. Critical Reviews in Plant Sciences 35(5-6):349-363. https://doi.org/10.1080/07352689.2016.1265363
5. Sawler J, Stout JM, Gardner KM, et al. 2015. The genetic structure of marijuana and hemp. PLoS ONE 10(8):e0133292. https://doi.org/10.1371/journal.pone.0133292
6. McPartland JM, Small E. 2020. A classification of endangered high-THC cannabis (Cannabis sativa subsp. indica) domesticates and their wild relatives. PhytoKeys 144:81-112. https://doi.org/10.3897/phytokeys.144.46700
7. Chouvy P-A, Afsahi K. 2014. Hashish revival in Morocco. International Journal of Drug Policy 25(3):416-423. https://doi.org/10.1016/j.drugpo.2014.01.001
8. Clarke RC, Merlin MD. 2013. Cannabis: Evolution and Ethnobotany. University of California Press. https://doi.org/10.1525/9780520954571
9. Smart R, Caulkins JP, Kilmer B, Davenport S, Midgette G. 2017. Variation in cannabis potency and prices in a newly legal market: evidence from 30 million cannabis sales in Washington state. Addiction 112(12):2167-2177. https://doi.org/10.1111/add.13886
10. Hazekamp A, Fischedick JT. 2012. Cannabis: from cultivar to chemovar. Drug Testing and Analysis 4(7-8):660-667. https://doi.org/10.1002/dta.407
11. Schwabe AL, McGlaughlin ME. 2019. Genetic tools weed out misconceptions of strain reliability in Cannabis sativa: implications for a budding industry. Journal of Cannabis Research 1:3. https://doi.org/10.1186/s42238-019-0001-1
12. Oswald IWH, Ojeda MA, Pobanz RJ, et al. 2021. Identification of a new family of prenylated volatile sulfur compounds in cannabis revealed by comprehensive two-dimensional gas chromatography. ACS Omega 6(47):31667-31676. https://doi.org/10.1021/acsomega.1c04196
13. Oswald IWH, Paryani TR, Sosa ME, et al. 2023. Minor, nonterpenoid volatile compounds drive the aroma differences of exotic cannabis. ACS Omega 8(42):39203-39216. https://doi.org/10.1021/acsomega.3c04496
14. Gilbert AN, DiVerdi JA. 2018. Consumer perceptions of strain differences in Cannabis aroma. PLOS ONE 13(2):e0192247. https://doi.org/10.1371/journal.pone.0192247