Smell is our oldest sense. Before we had language or art, and before we could name the things around us, we depended on scent. It helped us sense safety or danger, recognise family or strangers, and notice life and death in the air.

The olfactory nerve connects directly to the limbic system, bypassing the thinking part of the brain almost entirely. This is why a scent can return you to a feeling before you have any words to explain it, and why scent has always felt sacred to us: it reaches the oldest parts of us before we even think. For a fuller exploration of what this means in practice, including specific oils for grief, anxiety, low mood, and the broader emotional landscape, see Aromatherapy for Emotional Wellbeing.

Here, the focus stays with the older story: how scent became sacred, what the oils themselves carry, and how to work with them as a practice rather than a remedy.

From Temple Smoke to Essential Oil

People have used aromatic plant medicine for as long as history has been recorded, and it appears in almost every culture. From there, the record of scent moves through ancient practice and ritual.

  • In ancient Egypt, fragrant resins like Frankincense, Myrrh, and the temple incense Kyphi were used in ceremonies, for embalming, and as medicine. Each temple had its own secret Kyphi recipe, often with about sixteen ingredients, including Myrrh, Juniper, and raisins soaked in wine and honey. This incense was burned every evening to help the sun god Ra travel through the underworld and return at dawn. Egyptian doctors were skilled with aromatic preparations, and the first known perfumer was not Egyptian but Mesopotamian: Tapputi, a chemist whose work was recorded on a tablet from the second millennium BC. From Egypt, the story continues east and west through other traditions.
  • The Hebrew Bible preserves its own precise formula: a sacred anointing oil of Myrrh, Cinnamon, Calamus, and Cassia steeped in Olive oil, used to consecrate the Ark of the Covenant and the high priests, so sacred that its unauthorised use carried serious consequences. Here, scent was not decoration but consecration, a material way of setting people and objects apart for spiritual work.
  • Centuries later, in the Gospel of John, Mary Magdalene anoints Jesus’ feet with Spikenard, a single act of devotion that has echoed through Christian art and ritual ever since.
  • Further east, in ancient India, the Vedic tradition developed Ayurveda, the science of life, in which aromatic plants and their oils played a central role in balancing the three doshas and maintaining health. The Charaka Samhita, one of the oldest Ayurvedic texts, mentions hundreds of medicinal plants, many of them aromatic.
  • China’s own written record of aromatic plants and their uses reaches back further still, to around 4,500 BC.

The word perfume comes from the Latin per fumum, meaning through smoke. From that idea, incense became the first way people used scent: burning aromatic resins and woods as offerings, for purification, and to connect with the divine. As the smoke rose, their prayers rose with it.

The process of distilling essential oils, the concentrated aromatic compounds of plants, was refined during the Islamic Golden Age. The physician and philosopher Ibn Sina (Avicenna), in the tenth and eleventh centuries, perfected steam distillation and wrote about the healing properties of plant essences. From his work, later healers gained a more precise way to use scent as medicine, and his methods became the basis for European botanical medicine for centuries afterwards.

Modern aromatherapy became a formal practice in the early twentieth century, thanks to French chemist René Maurice Gattefossé. After burning his hand in a lab accident, he plunged it into Lavender oil and noticed it healed quickly. That experience set him on a lifetime of studying the healing properties of essential oils, and gave the practice its name.

The Oils and What They Carry

Essential oils are not oils in the common sense of the word. They do not feel greasy, and they evaporate cleanly. They are the volatile aromatic compounds of a plant: its immune system, its communication medium, its medicine. In practice, that means they are used not only for scent, but also for inhalation, topical application, and diffusion.

  • One drop of Rose essential oil contains the essence of dozens of roses.
  • One drop of Frankincense contains the sacred resin of a tree revered for longer than written history.

Working with essential oils is working with concentrated plant intelligence. The plant has spent millions of years developing these compounds in relation to its environment: as protection against bacteria and fungi, as attractants for pollinators, as deterrents for predators. When we use them, we are in some sense entering into that relationship, borrowing the plant’s wisdom for our own healing.

  • Lavender (Lavandula angustifolia) is the great balancer: gentle, clarifying, and almost universally safe. If you own only one essential oil, let it be Lavender. Its calming reputation runs so deep that a whole article in this series is devoted to using it and similar oils for anxiety, low mood, and sleep; see Aromatherapy for Emotional Wellbeing.
  • Frankincense (Boswellia sacra) is the oil of the spirit. Distilled from the resin of trees that grow in the arid highlands of Oman, Yemen, and the Horn of Africa, it has been burned as sacred incense for at least five thousand years. It deepens the breath, stills the mind, and opens a quality of consciousness that practitioners describe as connected, expanded, and close to the sacred.
  • Rose (Rosa damascena) is the most expensive essential oil in the world, requiring thousands of hand-picked petals to produce a single millilitre. Its frequency, when measured, is remarkably high, and it has been the oil of the heart in tradition after tradition. Its emotional uses, particularly around grief and love, are covered in depth in Aromatherapy for Emotional Wellbeing.
  • Clary Sage (Salvia sclarea) is the oil of vision and clarity. It was historically used to enhance dreams and open the inner eye, and its name derives from the Latin clarus, meaning 'clear'. It carries an expansive, almost euphoric quality that practitioners use to support meditation and intuitive work.
  • Cedarwood (Cedrus atlantica or C. deodara) is ancient, grounding, and still. The cedar has been revered across cultures from the Levant to the Americas: the great cedars of Lebanon built Solomon’s temple, and the red cedar is sacred to many First Nations peoples. The oil anchors and protects, and its woody warmth is deeply steadying during periods of change.

Ways of Working

The most common methods of using essential oils are inhalation, topical application, and diffusion. Each works differently, but all bring scent into direct contact with the body or space.

  • Inhalation is the most direct. A drop on the palms, rubbed together and cupped over the nose and mouth, draws the aromatic molecules immediately into the bloodstream via the lungs. A drop on a tissue, or inhaled directly from the bottle, works similarly, and the effect can be felt within seconds.
  • Topical application uses the skin as its route of administration. Essential oils must always be diluted in a carrier oil before they touch skin; for which carrier suits which purpose, and for safe dilution ratios, see Carrier Oils & Their Properties and Blending Your Own Oils. Once diluted, the oils can be applied to pulse points, the soles of the feet, or the chakra points of the body. Different traditions place anointing oils at different points for different reasons: the third eye or forehead for spiritual opening and intuition; the crown for connection to the divine; the heart for love and compassion; the throat for truth and voice; the wrists for setting an intention that travels with you through the day.
  • Diffusion spreads aromatic molecules through a space and affects everyone in the room. You can use a ceramic or ultrasonic diffuser, place a drop of oil on a radiator, or add it to a bowl of warm water. The right oil can visibly change a room's mood and atmosphere.

It is also worth knowing that not every sacred fragrance is alcohol-based or even a true essential oil blend. Attars, traditional perfumed oils from South Asian and Middle Eastern cultures, are made by distilling plant material directly into a sandalwood base. This creates an oil-based, alcohol-free fragrance especially valued in Islamic tradition, where alcohol perfumes are usually avoided. The word attar comes from the Arabic 'itr, meaning fragrance or essence.

Scent as Ceremony

Beyond the therapeutic, aromatherapy at its deepest is a ceremonial practice: a way of marking space, marking intention, marking the transitions between ordinary life and something more deliberate. In practice, that means using scent to make a shift felt: before meditation, before prayer, or before any moment that asks for presence.

Lighting a Frankincense-scented candle before meditation is not just about the oil’s physical properties. It is a signal to the self that we are doing something different now. The scent becomes a threshold, and the body learns, over time, to recognise it, to shift, to open, to arrive more quickly at the state the practice calls for.

This is the principle of anchoring, used both in the tradition of neuro-linguistic programming and in the far older tradition of ceremonial magic: the repetition of a sensory stimulus in association with a particular state of consciousness, until the stimulus becomes capable of reliably inducing that state on its own.

The priests of ancient Egypt understood this. The incense at the altar was not decoration. It was technology.

A word of caution: many prized aromatics, including Sandalwood, Frankincense, Rosewood, and wild Palo Santo, are threatened by overharvesting and habitat loss. To use them responsibly, use them sparingly, buy from responsible growers, and be willing to pay a fair price for the real thing rather than reach for a synthetic substitute.

Start simply. Choose one oil that appeals to you, and use it regularly in one situation, before sleep, in meditation, or at the writing desk. Pay attention to what changes, and how your body begins to respond to the scent itself, even before anything else happens. Both Blending Your Own Oils and Aromatherapy for Emotional Wellbeing include guidance on keeping a record of what you notice as you go, if you want somewhere to track it.

Plants are patient teachers. They have been offering their wisdom long before humans were here to learn from them.

This is the opening essay in the Aether section’s aromatherapy series. From here: Aromatherapy for Emotional Wellbeing for the felt, day-to-day work of scent; Blending Your Own Oils for the craft of combining oils; and Carrier Oils & Their Properties for what carries the oils into the skin.