American casinos pump synthetic human pheromones into the air to encourage aggressive gambling.
"According to a 2004 press release from Enhanced Air Technologies, a firm based in British Columbia, at least one major Las Vegas casino also pumps synthetic human pheromones into the air to increase business. The company claims its 'Commercaire' pheromone instills a sense of comfort and security in humans, which makes them feel more at ease and increases the likelihood of repeat visits."
Who knows what other interesting human emotions and desires can be artificially stimulated this way?
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