Terpenes, explained: why two flowers at the same THC can feel completely different

Two patients, same prescription strength, same THC percentage — and completely different experiences. A lot of that comes down to terpenes: the aromatic compounds that give each cannabis cultivar its smell, and that shape how it actually feels to use. They’re worth understanding, because they’re one of the most useful things to track when you’re working out what suits you.

This is general information, not medical advice. What you’re prescribed, and how you use it, is a decision for you and your prescriber.

What terpenes are

Terpenes are natural compounds found across the plant world — they’re why pine smells like pine and lemon peel smells citrusy. Cannabis is unusually rich in them. They aren’t unique to cannabis and they aren’t “the high” (that’s mainly THC), but they carry the aroma and flavour, and there’s growing interest in how they interact with cannabinoids.

When a pharmacy lists a flower’s “profile,” the terpenes are a big part of what’s being described.

The common ones

You’ll see these names again and again on cultivar descriptions:

• Myrcene — earthy, musky; the most common cannabis terpene, often associated with relaxing, heavier flower.
• Limonene — citrus; associated with brighter, more uplifting profiles.
• Pinene — pine; sharp and fresh.
• Linalool — floral, lavender-like; calming in reputation.
• Caryophyllene — peppery, spicy; the one that also interacts with the body’s cannabinoid system.
• Terpinolene and humulene — herbal and hoppy notes you’ll spot in some cultivars.

These are broad characterisations, not guarantees. Your own response is individual — the same flower won’t read identically for everyone.

The “entourage effect”

You’ll hear the term entourage effect — the idea that cannabinoids and terpenes work together, so the whole profile matters more than any single number. The research is still developing and shouldn’t be oversold, but it’s a useful reason not to choose flower on THC percentage alone.

How to actually use this

The practical bit: keep a simple note. When a cultivar suits you, jot down its name and its dominant terpenes. Over a few prescriptions you’ll start to see a pattern — maybe limonene-forward flower works for daytime and myrcene-heavy for evening. That note is genuinely helpful information to take back to your prescriber.

A dry-herb vaporiser helps here too. Lower temperatures release the lighter, more aromatic terpenes first; higher temperatures bring out more of the heavier compounds. Adjusting your device is part of dialling in what works.

Try it, ask us

If you’re a member, this is exactly the kind of thing the lounge is for — compare notes with people who’ve tried different profiles, ask our team about devices and temperatures, and work out what’s worth raising at your next clinic appointment. We don’t prescribe and we won’t push a product; we’ll just help you understand your options.

New to all this? Start with Medical cannabis, explained, or see how to get a prescription.