what makes weed smell

Terpenes and Terpenoids: The real cause of smelly, stinky cannabis

The smell and scent of cannabis buds is produced by plant chemicals known as “terpenes” and “terpenoids.”

Examples of different terpenes – this diagram shows their chemical structure

Terpenes are produced by many types of trees, plants and flowers as part of their essential oils. Vitamin A is an example of a complex terpene that we’re all familiar with. The aroma and flavor of hops (which is considered highly desirable in some beers) also comes from the presence of terpenes.

Terpenoids are closely related to terpenes (some authors refer to both types of organic compound as just “terpenes”) and are naturally found in all classes of living things. Terpenoids are created with terpenes are denatured by forces like oxidation. So for example, the process of drying and curing your buds will convert many of the terpenes into terpenoids.

Terpenoids are a big part of what makes up the the scent of most flowers, as well as the flavors of many household spices like cinnamon, rosemary, cloves and ginger.

The unique combination of terpenes and terpenoids produced in cannabis buds cause most of their odor and flavor as well.

Terpenes and terpenoids may or may not actually affect cannabis potency. We know that these organic compounds are responsible for the taste and smell that is unique to individual strains. However, there are many growers who believe that terpenes and terpenoids can actually modify the effect of THC on your body, possibly making a smaller amount of THC feel more potent. More studies are needed, but if this is true than the terpene and terpenoid content may actually even affect the perceived potency of your buds, too.

Regardless of exactly how it works, I believe that the combination of cannabinoids, terpenes and terpenoids found in cannabis buds cause an “entourage effect,” which means that the impact of whole cannabis buds may be greater than the sum of its parts (which may explain why so many people seem to get better results from using complete cannabis oil as opposed to a synthetic version of pure THC like the drug “Marinol”). Many growers believe that the presence of terpenoids may buffer the effects of THC to actually prevent unwanted side effects (like paranoia or anxiety) from occurring.

In any case, each cannabis plant will tend to produce different levels of different terpenes and terpenoids, and this is what gives buds a specific taste and smell.

Terpenes & Terepenoids play a big role in how cannabis buds smell

Picking the right strain will play a big role in your final terpene content in your buds, but there are also many steps you can take as a grower to produce buds that smell the way you want.

Note: Many cannabis “concentrates” like BHO (butane hash oil) actually do not contain high levels of terpenes and terpenoids. In fact, any extraction method that involves heating the plant matter will burn off many terpenes and terpenoids (which evaporate into the air at a lower temperature than THC). This is why many concentrates don’t have a strong or distinctive “cannabis” smell or flavor, even though they were derived directly from cannabis buds. It may also partially explain why different types of concentrates have different effects even if they are derived from the same buds.

Extraction methods which do not involve heating the plant will likely contain higher levels of terpenes and terpenoids, and therefore may display different therapeutic effects.

The link below will teach you how to alter the terpene and terpenoid content of your cannabis plants during the growing process, improving the final taste and smell of your buds.

Learn how growers can increase the terpene and terpenoid content of their growing cannabis buds!

How do "terpenes" and "terpenoids" affect the taste and smell of your cannabis buds?

What makes weed smell

The parlance of pot is chock-full of terms that are used to describe the various aromas created by cannabis. Marijuana can be piney, earthy, gassy, spicey, or exude a veritable fruit basket of odors including: banana, melon, orange, lemon, tangerine, and more.

And while most of these fragrances are considered pleasing by most, one scent in particular, skunk, has a decidedly unpleasant connotation. But what exactly is skunk weed? And why does it smell that way?

Terpenes Are the Key

The variety of smells found in cannabis are largely produced by terpenes, a class of aromatic chemicals found in many plants and even some insects. More than 20,000 different terpenes have been identified, making them the largest category of plant compounds discovered. At least 200 different terps have been found in cannabis, although only a handful are the most dominant.

Pinene can give pot a pine-like fragrance, while caryophyllene is peppery. Limonene has a citrusy scent and terpinolene is fruity. Myrcene, the most prevalent cannabis terpene, is earthy or musky, a trait that is partly responsible for the skunky funk of some strains.

Some less common terpenes, however, give off the odor of a different class of chemicals known as thiols. These compounds have a sulfurous smell that can be reminiscent of rotten eggs, fuel, or even farts. Thiols are also responsible for the unique and very recognizable stench of skunk spray, a defense mechanism that can help keep the animal safe from predators. Strains of cannabis with terpenes that have an aroma similar to these thiols are often referred to as skunky or skunk weed.

Strains of Skunk Weed

There are many strains of cannabis that express the skunky smell of these terpenes. Skunk weed varietals got their start in the 1970s with the introduction of Skunk #1 by Sacred Seeds, a group of breeders in Northern California led by David Watson, also known as Sam the Skunkman. Skunk #1 is a cross of short, bushy Pakistani and Afghani varietals cultivated for hash, and tropical strains from Asia and South and Central America.

Watson was one of the first breeders who recognized that, while THC was the component of cannabis mainly responsible for the high it imparts, terpenes were also important and could intensify and modify the plant’s psychoactive effects through the entourage effect. As a result, when evaluating breeding stock for his next cross, Sam the Skunkman often let the aroma of these potential parents be his guide.

Gallery — Cannabis Up-Close and Personal:

Besides their inherent skunkiness, the flowers of Skunk #1 also impart musky and earthy aromas with subtle floral and fruity notes, while the flavor of the strain is generally woodsy, sweet, and fruity. The clear-headed high of this original skunk weed can be somewhat euphoric, heighten creativity, and relieve stress. Medical marijuana patients have reported success using the strain to treat pain, asthma, glaucoma, stress, nausea, vomiting, and as an appetite stimulant.

The success of Skunk #1 made it an ideal strain to breed with other plants in order to create different varieties of skunk weed. After serving a stint in prison and being released in 1982, Watson moved to the Netherlands, taking several kilos of seeds with him. He then resumed his breeding career, and started the seed company Cultivator’s Choice in Amsterdam.

Soon, other Dutch breeders were also offering their own strains of skunk weed, with varieties such as Super Skunk, Jack Herer, Northern Lights, and Early Girl making their debut on the cannabis scene. Today, these varieties have become popular genetics for breeders who have produced literally hundreds of strains with skunk in their name or terpene profile, including Skunk Dawg, Lemon Skunk, Skunky Diesel, Skunk Haze, and (my personal favorite) Thelonious Skunk.

Other Meanings of Skunk Weed

The word “skunk” can refer to more than just genetic terms for cannabis, too. For people who don’t use cannabis (and even some who do partake), all varieties of cannabis smell skunky. To a certain extent this is true, although more experienced cannaphiles will appreciate the other aromas and notes present in a particular strain’s bouquet.

In the United Kingdom, the term “skunk weed” has taken on a more generic meaning. There, skunk doesn’t refer to the aroma of particular strains of marijuana. Rather, it is a moniker that designates highly potent pot. Just about any kind of super-stony sensimilla flower that is cultivated for smoking will qualify as skunk weed across the pond.

Despite the nuances of meaning that the term skunk weed can have from one person to the next, one thing is a given: When you smell that sweet stank, you’re sure to be in for a good time.

Cannabis flower has more unique scents than the rainbow has colors. But why does weed sometimes smell like a skunk?