Researchers developed a glossary for cannabis scents. They debunked certain theories on what makes marijuana strains smell unique and created a lexicon that will help consumers and business owners better categorize varieties. Notably, they found that— contrary to popular belief—terpene content is a poor predictor of cannabis’s scent profile.
In the study that was published in this month’s journal PLOS, Oregon State University researchers recruited a panel consisting of 21 experts to judge 91 samples containing unburned marijuana flower. The panel had to sniff the various varieties and check off those aroma descriptors which they believed applied.
The primary objective of the study was to create and evaluate in a systematic manner a reproducible lexicon on aromas. Cannabis Inflorescence is the first step towards a standard, evidence-based framework to describe Cannabis The study states that “Aroma” is a key component of the research.
While this study doesn’t generate or validate an official lexicon as such, it is an important stage in the development of a comprehensive system to describe Cannabis,It is said. The new sensory vocabulary is organized and refined into a data-driven, coherent structure for use in both research and application contexts.
Its ability to distinguish samples in a consistent manner is a testament to its usefulness as an instrument for both industry and scientific communication.
The study evaluated and generated a description aroma lexicon consisting of 25 words with reference standards.
The study selected 8,075 different descriptors. Three stood out above the rest, and accounted for 26% of all marketed descriptors. These were “herbal,” “citrus” and “woody.”
Researchers found that, despite the common belief that the terpenes present in cannabis plants are responsible for the aroma of each strain, this is not the whole story.
The report states that “terpenes alone do not accurately predict the sensory quality of a product.” “Terpinolene was the only compound consistently associated with sensory descriptors, specifically ‘citrus’ and ‘chemical.'”
“Total terpene concentration was also not correlated with the frequency of use of each attribute per sample, suggesting that intensity of aroma…cannot be directly inferred from total terpene content… [Q]”Uantitative chemical changes do not translate into perceptible sensory differences.”
The researchers concluded that “despite chemical groupings and sensory clustering, there was no correlation between the two. This underscores an important point: the terpene profile alone cannot predict sensory profiles of samples.” This is important, given that the Cannabis Industry’s marketing and labeling practices rely too heavily on terpenes.
The profiles of volatile sulfur compounds or terpenes did not strongly predict sensory perception. These results highlight the limitations of using chemical composition to predict aroma quality.
The study also revealed that varieties with high THC and low CBD were “more frequently described as ‘skunky,’ ‘musty,’ and ‘animalic,” whereas low THC and high CBD strains were commonly associated with the descriptors “citrus,” “fruity,” and “candy-like.”
The findings of this study are relevant to the present situation, especially in view Cannabis market, which is saturated with inaccurate potency claims, misleading ‘effect’ descriptions, and persistent safety concerns, including pesticide contamination,” the authors said. As the cannabis industry moves from an unregulated environment to a legal one, it is important to provide consumers with tools to assess product quality that go beyond THC, as this has only a weak correlation to enjoyment and doesn’t impact on aroma.
The researchers said, “Aroma is the only predictor known of subjective satisfaction.” “However, as this study and others show, terpene profiles do not map cleanly onto sensory attributes, and traditional classifications such as ‘indica’ and ‘sativa’ have been shown to be unreliable predictors of Cannabis attributes.”
Due to the weak correlation between terpene concentration and sensory qualities, this study proposes that the “key perception drivers” may actually be in unmeasured classes of compounds such as esters or aldehydes that act in a synergistic fashion, causing effects that go beyond terpene contributions.
This study has developed and evaluated 25 terms for aroma. Cannabis inflorescence. The study concluded that this work provides a basis for future research with an initial list descriptors, and an associated sensory technique. The study concludes that future work should include a larger sample of inflorescences to define associations between volatile aromatics (VOCs) and aroma descriptors. They also need to expand the lexicon by evaluating and validating more terms. Included consumer hedonic information would enhance our understanding of the aroma-driven perceptions of quality and consumers’ liking.
The report says: “Additionally agronomic factors and post harvest variables such as farm origin and maturity, drying techniques, storage methods, and trimming method warrant investigation through sensory and chemical lens.” The attributes can be expanded to include a wider range of characteristics as this lexicon is built and expanded with more global representative samples. Cannabis aromas. This information will guide breeding efforts, optimize production techniques and enhance the aromatic and sensory quality of Cannabis products.”
The study was published about a week after another group of researchers conducted a similar, sensory-guided, extensive research on the compounds that give dried cannabis its distinctive fragrance. They discovered dozens of chemicals previously unknown, which shape the scent of the plant. The findings, taken together, expand the scientific understanding of marijuana past the commonly held beliefs about terpenes CBD, and THC.
Studies based on standardization research for cannabis strain identification. Researchers discovered in 2022 the common marijuana strain labeling can be very misleading for customers. Researchers analyzed almost 90,000 marijuana samples from across six states.
Research earlier this year on cannabis genetics suggested that incentives in the legal marijuana market—such as the desire for plants to mature faster and produce more cannabinoids for extraction—may be leading to a decline in biodiversity of the plant worldwide.
This paper also builds on a July 2025 scientific review in the journal Molecules that took a deep dive into the flavors and aromas of marijuana, examining how the plant’s genetic makeup, cultivation methods and post-harvest processing affect the various compounds that give cannabis products their distinctive palate.