Alan Hirsch’s 1995 Las Vegas casino study documented 45% more revenue in scented slot areas. This is the most commercially dramatic single data point in the entire scent marketing evidence base. Here is what the study found and where its findings apply.
The Hirsch Study
In 1995, neurologist Alan Hirsch conducted a controlled experiment at a Las Vegas casino. Two identical slot machine areas were compared over the same time period — one scented with a pleasant floral fragrance, one unscented. The scented area generated 45% more revenue. The study controlled for other variables and the result was statistically significant. It has been independently replicated in subsequent research across casino, retail and hospitality environments.
Why the Effect Is So Large in Casino Environments
Casino environments are uniquely receptive to ambient scenting effects for several reasons. First, casinos are fully air-conditioned, recirculated-air environments — ideal for consistent fragrance distribution. Second, casino patrons are in a state of heightened emotional arousal, making limbic system influences proportionally more powerful. Third, the decision to continue playing versus leaving is made repeatedly over hours — and ambient scenting’s approach motivation effect influences each of those micro-decisions. Fourth, casino environments deliberately deploy multiple sensory stimuli (sound, lighting, layout) to influence behaviour — ambient scenting integrates naturally into this environment.
Applications Beyond Las Vegas
The Hirsch study’s commercial implications extend beyond Las Vegas strip casinos to every gaming environment globally — Singapore’s Marina Bay Sands and Resorts World Sentosa casinos, Macau’s integrated resorts, UK casinos, Australian club gaming floors. Equal Strategy has delivered scent programmes for Resorts World Group across 15 years of engagement. The casino application is the most commercially documented single case for the direct revenue impact of professional ambient scenting.
The Broader Principle
The 45% revenue figure has become the most-cited single statistic in scent marketing because its magnitude is so dramatic. But the underlying mechanism — positive ambient scent creating approach motivation that reduces avoidance behaviour and extends time-in-venue — applies to every commercial environment with a dwell time relationship to revenue. The casino case is the extreme version of the same effect documented in retail (26% longer dwell time), F&B (15–20% longer dining duration) and hospitality generally.
Related Resources
Frequently Asked Questions
Is the 45% casino revenue figure real or marketing exaggeration?
The Hirsch (1995) study was published in the peer-reviewed Journal of Business and Psychology. The methodology was a controlled experiment with documented statistical significance. The figure is real, though it should be understood as a specific experimental result rather than a guaranteed commercial outcome for every casino deployment.
Does scenting work in Singapore’s casino environments?
Equal Strategy, part of Sensory Experiences Group, has delivered scent programmes for Resorts World Group over 15+ years. Singapore’s integrated resort casinos are fully air-conditioned, controlled environments — technically ideal for the same cold-air dry vapour ambient scenting documented in the Hirsch study.
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