Cannabis and the Sensing Body

Most accounts of cannabis and the senses stop at sight, sound, smell, taste and touch. The more interesting story is about the senses we rarely name, and it’s the one that matters most in therapy.

Most popular writing on cannabis and the senses makes the same claim. It sharpens them. Colours look brighter, music sounds richer, food tastes more vivid. It’s an appealing idea, and parts of it match what people describe. But it’s only a fraction of the story, and the part it leaves out is the part worth understanding.

That’s because we don’t have five senses. We have eight.

Eight senses, not five

Occupational therapy and sensory-integration practice use a fuller map of the senses than the familiar five. Alongside the senses that take in the outside world, three quieter systems take in information from the body itself. They run constantly, mostly below awareness, and they shape how steady, grounded and safe we feel from one moment to the next.

The vestibular sense sits in the inner ear. It tells you which way is up and whether you’re moving. Proprioception comes from receptors in your muscles and joints and tells you where your limbs are and how much effort you’re using, without your having to look. Interoception, sometimes called the eighth sense, is your reading of the body’s interior: heartbeat, breath, hunger, tension, the flutter of nerves, the warmth of ease.

Cannabis leaves its clearest mark on these three, far more than on the familiar five.

The familiar five: less dramatic than the stories suggest

The evidence that cannabis heightens the outward senses is surprisingly thin, and sometimes it points the other way. Controlled studies have found that a dose of THC can reduce the accuracy of smell rather than improve it, and the research on touch is too sparse to draw firm conclusions. Other work has found that being intoxicated can make it harder, not easier, to read emotion in someone’s face.

This sense of sharper perception seems to come mostly from attention and expectation: noticing more, lingering longer, expecting richness. It isn’t that the senses themselves get keener. That doesn’t make the experience any less real, but it does mean the headline is more about where the mind turns its attention than about the sense organs.

The hidden three, where the real story is

The eight sensory systems are grouped by how far inward they reach. Cannabis’s clearest effects fall on the inner three.

Balance and body position

THC acts on the body’s own cannabinoid system, and the receptors it binds to are especially dense in the cerebellum, the part of the brain that governs balance and coordinated movement. The effects are well documented. As the dose rises, balance becomes less steady, the body sways more, and coordination becomes less precise. This is the felt sense of being unanchored or clumsy. It reflects the vestibular and proprioceptive systems being quietened together. The senses that usually tell you, without any effort, that you’re upright and gathered become less reliable.

The inner sense

The richest effects are on interoception. The insula is the part of the brain that reads the body’s internal state, registering hunger, heartbeat and the whole class of feeling we call a gut sense, and it’s closely involved in how THC produces its effects. Imaging research shows that THC loosens the connections within the brain networks responsible for bodily awareness and emotion.

It isn’t simply a matter of turning the dial up or down. People who use cannabis often feel more connected to their bodies, while the wider picture is more complicated, shifting at different doses and bound up with mood. So cannabis doesn’t just change what you sense in the world. It changes how you sense yourself.

When the inner sense has already been hurt

Trauma reaches into this same system, and that’s what makes it matter clinically.

Living through frightening or overwhelming experiences tends to disturb interoception. The body can become a place that feels unsafe to be in, and people settle into one of two hard relationships with their own interior. Some become hypervigilant, flooded by internal signals and reading them as threats, so a racing heart is taken as danger rather than information. Others go the other way and numb, blocking the body’s signals out of awareness until the inside feels muted or far off. Both are understandable. Both make it hard to notice and settle with what you’re feeling.

Those two patterns mirror the sensory modulation patterns, over-responsivity and under-responsivity, carried into the inner sense. The body’s interior can be turned up too loud or shut down too far, just like any other sensory channel.

This is the ground cannabis acts on directly. When your inner sensations feel threatening, reaching for something that quietens them makes complete sense, and it works, because the threatening signal really does grow quieter. The body’s own cannabinoid system is tied up with the emotional numbing that can follow trauma, so cannabis offers a chemical version of a dissociative quiet the nervous system was already drifting towards.

This is where the difference between a one-off and a habit becomes the whole point. In the moment, the quieting feels like ease. Over time, though, a more troubling pattern can emerge: people feel more in tune with their bodies while actually reading them less accurately. That gap, between feeling connected to the body and genuinely sensing it well, is itself a sign of disturbed interoception. What brings relief in the short term can, with repetition, deepen the very disconnection trauma created in the first place.

Relief is not the same as repair. Quieting a signal you can’t bear is not the same as learning to feel it safely.

Why this matters if we’re working together

A lot of the work I do, including EMDR, trauma-focused work and hypnotherapy, relies on something specific: being able to notice what’s happening in your body, tolerate it, and stay with it while we work. Processing a hard memory safely depends on feeling the sensation without being swamped by it and keeping one foot in the present.

Anything that strongly quietens the inner sense works against that. It’s why I’ll gently ask about substance use and why I’d rather we meet when you’re not under the influence. That isn’t disapproval, and it isn’t a judgement about what you do with your own life. The work runs through the very sense cannabis turns down, and I’d rather we had full use of it together.

If cannabis is part of how you cope right now, that’s worth talking about openly rather than leaving at the door. Often it’s doing a real job, holding something at bay that has felt unbearable to feel. Understanding that job is usually more useful than simply setting it aside.

A note on the evidence

Much of this research is correlational, and people who use cannabis to manage trauma differ in many ways from those who don’t, so cause and effect are hard to separate. The effects are also dose-dependent, and higher and lower doses can pull in different directions. Mapping the neuroscience onto the eight sensory systems is an interpretive lens I find clarifying, not something the original studies set out to claim. None of this is settled science. It’s offered as a way of thinking, not a verdict.

Selected sources

Postural sway and balance in cannabis users — Drug and Alcohol Dependence, 2018.

Involvement of the insula in the psychotropic effects of THC — International Journal of Neuropsychopharmacology, 2011.

Cannabinoids, interoception and anxiety (review) — Neuroscience & Biobehavioral Reviews, 2019.

Interoceptive awareness and post-traumatic stress (meta-analysis) — 2026.

If any of this feels close to home for you

Whatever your relationship with your own body and its signals, it can be understood and gently worked with. If you’d like to talk things through, I’d be glad to hear from you.

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Elemental Therapy Services

Psychotherapy counselling and hypnotherapy — England, Scotland & worldwide online.

This article is psychoeducational and is not a substitute for individual clinical advice. Cannabis is a controlled substance in the United Kingdom; nothing here is intended to encourage its use.