Skunk Myth: Why Cannabis Smell Isn't Just Terpenes

Many assume terpenes = cannabis smell. Check myrcene, linalool, pinene on the jar and you think you know what to expect. But the classic skunky, diesel, or cheesy character doesn’t come from them. Modern research shows that the recognizable aroma is driven by minor volatile compounds (including sulfur-containing ones), genetics, and growing and curing conditions. That’s why the same cultivar can smell different from different producers.

Terpenes are only part of the picture

Terpenes (myrcene, linalool, pinene, caryophyllene, and dozens more) do contribute to aroma and flavor — citrus, pine, floral, spicy. But there’s little evidence they create the skunky, sharp, gasoline-and-cheese profile associated with classic cannabis. In 2021, a study (ACS Omega, comprehensive 2D gas chromatography and mass spectrometry) described a new family of volatile sulfur compounds (VSCs) in cannabis — prenylated VSCs. The main odorant for the skunk smell is 3-methyl-2-butene-1-thiol. Chemically, these compounds are related to volatile sulfur compounds in garlic — hence the sharp, recognizable note. Terpenes still set the overall “background” (citrus, pine, lavender); the diesel/skunk/cheese nuances come from minor non-terpenoid volatiles — thiols, esters, other sulfur-containing molecules.

What are VSCs and thiols?

Thiols are organosulfur compounds with an –SH group. They often have a strong, pungent smell at low concentrations. In wine and hops, thiols are well known for tropical and “catty” notes; in cannabis they help form the gassy, skunky, and partly citrus profile. Prenylated VSCs are sulfur volatiles with a prenyl (isoprenoid) fragment, linking them to plant metabolism and to how aromatic precursors build up in the final weeks of flowering and during curing. Concentrations of these compounds change over time: they rise in late flowering, peak during curing, and can drop within a week of storage. So the same cultivar, harvested the same day but dried and cured differently, will smell different.

Why the same cultivar smells different at different farms

Genetics set the potential — which enzymes and biosynthetic pathways a cultivar has. Growing conditions — light, stress, nutrition, temperature, humidity — affect metabolism and how many volatiles the plant produces. Two clones in different greenhouses or farms can differ noticeably in aroma. Drying and curing are critical: duration, humidity, and temperature determine volatile profiles; prenylated VSCs peak during curing and can decline with storage. So “the same strain” from a dispensary and from another farm or home grow often smell and feel different. Soil, substrate, and nutrients also shape secondary metabolism and volatiles. Different terroir, different bouquet. Bottom line: you can’t describe smell by terpene percentage alone. Genetics, environment, drying, and curing matter — and the skunk/diesel character is driven largely by minor volatiles (VSCs, thiols), not only terpenes.

What this means for choosing and describing cannabis

Don’t fixate on “terpene percentage” as the only measure of aroma. Terpenes set the general direction; the characteristic skunk/diesel/cheese comes from minor volatiles and conditions. One cultivar doesn’t mean one smell — different farms and curing give different profiles. Consider producer and conditions, not just strain name. Look at the full profile: cannabinoids + terpenes + production conditions.

This article is for informational purposes only. Responsible use and compliance with local laws are your responsibility.