Terpenes are the aromatic compounds that give cannabis, and pine needles, and lemon peel, their smell. Cannabis produces them in unusual variety, and they are the main reason two jars with nearly identical THC readings can feel like different products.

They are also the subject of a great deal of overstatement. Here is a careful version.

What is reasonably well supported

Terpenes are responsible for aroma and flavor. That is not in dispute and it is not a small thing, because aroma drives a lot of what people describe as the character of a strain. Several terpenes have documented pharmacological activity in isolation, and caryophyllene in particular binds directly to the CB2 receptor, which makes it a cannabinoid by function as well as a terpene by structure.

What is still uncertain

The entourage effect, the idea that terpenes and cannabinoids combine to produce effects that neither produces alone, is plausible and popular and not settled. The concentrations present in inhaled cannabis are low, and controlled human trials are thin. Treat confident claims in either direction with suspicion.

What is defensible is the practical version: people reliably report preferring particular terpene profiles, those preferences hold across different strains, and buying on profile works better than buying on name.

The six worth knowing

  • Myrcene. Earthy, musky, a little like ripe mango. The most common terpene in cannabis and the one most associated with heavy, sedating, sink-into-the-couch descriptions. Dominant in most of what gets shelved as indica.
  • Limonene. Citrus peel, sharp and bright. Associated with elevated, talkative reports. Also found in almost every lemon-scented cleaning product, which is a slightly deflating fact.
  • Caryophyllene. Black pepper and clove. The one that binds to CB2, and the terpene most often present in strains described as calming without being sleepy.
  • Pinene. Fresh pine, unmistakable. Reported as clear and alert. Frequently present in strains people choose for daytime.
  • Linalool. Floral, lavender. Small quantities, outsized influence on aroma, commonly linked to relaxation.
  • Terpinolene. Complex, herbal and faintly floral, hard to describe and easy to recognize once you have. Common in sativa-shelved varieties.

How to actually use this

Next time a product works well for you, look up its terpene report and note the top two. Do it three or four times and a pattern appears, usually a clear one. From then on you can walk into any dispensary in the state, ignore the strain names entirely, and ask which jars are limonene-forward or myrcene-dominant.

That question also tells the person behind the counter that you know what you are asking, which tends to produce a better recommendation than the percentage question does.

Freshness matters more here than anywhere

Terpenes are volatile. They evaporate with heat, light, air and time, and they go first, before the cannabinoids. This is precisely why old flower can test respectably for THC and still taste like paper. Check the packaging date, keep flower in an opaque sealed container, and do not store it on a windowsill.

Educational information only, not medical advice.