Why 5mg Isn’t 5mg

Understanding Bioavailability, Metabolism & Why Route of Use Matters

Lately, I’ve been getting a version of the same question: “Is the only difference between smoking and edibles how fast it hits?”

It’s such a reasonable question. And it reveals something important: we’ve been taught to think of cannabis dosing as a simple numbers game. But the truth is, your body is not a calculator, and your experience is more than math. You are a living, breathing, sensing being, not just a set of numbers and reactions.

But five milligrams is still five milligrams… right?

Not exactly.

When you inhale cannabis, hold it under your tongue, or eat it, you are not just changing the speed of onset.

You are changing:

• How much THC actually reaches your bloodstream

• Whether it passes through the liver first

• What metabolites are formed

• How long it lasts

• And how it feels in your body

Same plant. Different pathway. Different experience.

Let’s walk through it.

Inhalation (Smoking or Vaping)

When you inhale cannabis, cannabinoids pass through the lungs directly into the bloodstream.

This means:

• Onset within 1–5 minutes

• Peak effects within 10–30 minutes

• Duration of about 2–4 hours

• No first-pass liver metabolism

Estimated bioavailability: ~10–35%

Not all inhaled THC makes it into circulation. Some is lost through combustion, sidestream smoke, or incomplete inhalation. Yet inhalation may feel clearer and more controllable because the THC entering circulation is primarily delta-9-THC, without being converted into stronger metabolites first.

This makes inhalation faster-acting, easier to adjust in real time, and for many anxiety-prone or sensitive clients, this route can feel safer because it is self-correcting.

Sublingual (Under the Tongue)

When a tincture is held under the tongue for 60–90+ seconds, cannabinoids are absorbed through the oral mucosa and partially bypass the liver.

Onset: 10–30 minutes
Duration: 3–6 hours
Bioavailability: highly variable, potentially 15-35%

Here’s the nuance: if the tincture is swallowed quickly, it behaves more like an edible. Most people unintentionally use a hybrid route without realizing it. This is why education around technique is so important: how long you hold it literally changes the pharmacology.

Sublingual can be a beautiful middle path between inhalation and edibles, but it calls for intention.

Edibles: The Liver Alchemy

When cannabis is eaten, it travels through the digestive system and then through the liver before entering systemic circulation. This is called first-pass metabolism.

In the liver, delta-9-THC converts into 11-hydroxy-THC. This metabolite crosses the blood-brain barrier more efficiently, is often more psychoactive, and lasts longer.

Estimated bioavailability: ~4–12%

Interestingly, less THC may reach circulation compared to inhalation, yet the experience can feel stronger.

Onset: 30–120 minutes
Peak: 2–4 hours
Duration: 6–8+ hours

This is why 5 mg inhaled does not equal 5 mg taken orally. Even if the label says the same number, the body transforms the medicine differently.

Why This Matters for Dosing

The route of administration is not a minor detail, it is a primary dosing variable. For new consumers, elderly clients, those following microdosing protocols, or those with anxiety-sensitive nervous systems:

Edibles require the most conservative approach.
Inhalation allows the most flexible titration.
Sublingual sits somewhere in between, if done properly.

The Deeper Teaching

Cannabis is an ancient plant ally that works in partnership with your body and spirit. Science helps us understand the pathways, but your intuition and presence shape the experience, too.

It is a relationship between:

• Molecule

• Metabolism

• Nervous system

• Context

• Intention

When you choose how to ingest cannabis, you are choosing which door the medicine enters through. Each door leads to a different room. And part of sacred use is honoring the unique architecture of your own body: listening deeply to its signals, trusting your intuition, and accepting the wisdom that emerges from within.

If you’ve ever wondered why the same milligram feels completely different depending on the method, now you know.

And that knowledge changes how we dose, how we guide, and how we respect the plant.

If this clarified something for you, reply and tell me: What route feels most aligned with your nervous system right now?

Amy Olson
The Cannabis High Priestess