Why Scent Has a Measurable Effect on Behaviour

The olfactory system’s direct connection to the brain’s limbic system — which governs emotion and memory — is what gives scent its unusual power over behaviour. Unlike visual or auditory input, olfactory signals reach emotional processing centres before they are consciously identified. The emotional response comes first; the rational recognition of what was smelled comes second.

This means that ambient scent in a business environment can influence how customers feel in that space before they have consciously registered the fragrance. The resulting emotional state — calm, energised, comfortable, elevated — then colours their entire experience of the brand in that moment.

For a deeper explanation of the neuroscience, see our article on how scent influences memory and behaviour.

Impact on Dwell Time

Research conducted in retail environments has consistently found that ambient scenting increases the time customers spend in a space. A pleasant, appropriately calibrated fragrance makes an environment feel more comfortable and inviting — reducing the psychological pressure to leave and increasing the likelihood of browsing beyond an initial intention.

Extended dwell time directly correlates with increased purchase opportunity. Customers who spend more time in a retail environment are more likely to make unplanned purchases, consider additional products, and return. The fragrance itself is rarely the stated reason — customers typically attribute their extended stay to the general atmosphere of the space.

Impact on Purchasing Behaviour

Studies in supermarket and retail environments have found that ambient scenting can influence purchasing behaviour beyond simple dwell time extension. Research published in the Journal of Retailing found that congruent ambient scent — fragrance that matches the category of product being sold or the brand’s overall positioning — produced higher sales figures than incongruent or unscented conditions.

Congruence is the key variable. A fragrance that feels aligned with the brand environment amplifies the overall brand experience. One that feels incongruous can produce a negative effect — drawing conscious attention to the mismatch and disrupting the purchase mindset.

Impact on Brand Recall

Scent is the sense most closely linked to memory. Research has demonstrated that people can recall scent-associated memories with greater accuracy and emotional vividness than memories encoded through other senses — a phenomenon sometimes called the Proust Effect, after Marcel Proust’s famous account of involuntary memory triggered by smell.

For brands, this means a consistent ambient fragrance deployed across multiple touchpoints — or across multiple visits to the same space — progressively builds a scent-based memory association. Future encounters with that fragrance, even outside the brand environment, can trigger recall of the brand experience. This is the mechanism behind the effectiveness of signature scents in luxury hospitality — the scent becomes part of what people remember about staying at a particular hotel.

Impact on Perceived Quality

Ambient scent affects the perceived quality of both a space and the products or services within it. Research in retail environments has found that the presence of a pleasant, low-intensity ambient fragrance leads customers to rate product quality higher and perceive prices as more reasonable — even when no other variables have changed.

This effect is particularly significant for premium and luxury positioning, where the sensory environment is a key signal of brand quality. A space that smells considered and premium contributes to an overall perception of quality that the brand’s other design choices may have already worked to establish.

Impact on Employee Experience

The benefits of ambient scenting are not limited to customer-facing outcomes. Research in workplace environments has found that certain fragrance profiles — particularly fresh, citrus-forward, or clean green compositions — can support concentration and reduce perceived stress among employees. This is most relevant for office environments where client impression and staff comfort are both priorities.

The Limitations of the Evidence

It is worth being clear-eyed about what the research does and does not show. Most studies on scent marketing effects were conducted in controlled retail or laboratory environments, often with relatively small sample sizes and short time horizons. The effects documented are real but not always large in absolute terms, and they depend significantly on the quality and appropriateness of the fragrance used.

A poorly chosen fragrance — one that is too intense, incongruent with the brand, or inappropriate for the space — produces neutral or negative outcomes. The research supports the effectiveness of well-implemented scent marketing, not the idea that any ambient fragrance produces commercial benefits.

This is why fragrance selection, diffusion calibration, and professional implementation matter. See our complete scent marketing guide for a practical overview of implementation considerations.