Terpenes are volatile aromatic hydrocarbons produced by the same trichomes that produce cannabinoids. They're not unique to cannabis — they're what makes pine smell like pine, lemons smell like lemons, and lavender smell like lavender. Cannabis just produces a complex multi-terpene blend.

The dominant cannabis terpenes:

Myrcene — earthy, musky, slightly fruity. The most common terpene in cannabis. Also in mangoes, hops, lemongrass. Associated with the sedative, body-heavy end of effects.

Limonene — citrus, sweet, sharp. Found in citrus rind. Associated with mood lift and the brighter, more cerebral end of effects.

Caryophyllene — pepper, spice, woody. Found in black pepper, cloves, rosemary. The only terpene known to also activate the CB2 cannabinoid receptor directly.

Pinene — pine, sharp, resinous. Found in pine needles. Associated with mental clarity and respiratory effects.

Linalool — floral, lavender, soft. Found in lavender, basil, mint. Associated with the relaxing, sleep-leaning end of effects.

Terpinolene — fresh, herbal, slightly piney with a citrus edge. Found in nutmeg, tea tree, apples. Less common as a dominant — but defines some classic Hazes and Jacks.

Modern cultivar work is increasingly terpene-driven: chasing specific flavor profiles (gas, candy, dessert, fruit, fuel) rather than just THC percentages. Terpene profile is what makes one OG distinguishable from another.

Are terpenes psychoactive?+
Not directly in the way THC is, but they modulate the experience — the 'entourage effect' theory.
Why does the same strain taste different from different growers?+
Terpene production is sensitive to nutrient regime, environment, and cure. Genetics set the potential; the grower hits it or doesn't.