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istockphoto.com

Ever wonder why you feel so comfortable and at ease while at a casino? They are intentionally relaxing you. Casinos put expensive aromatherapy oils in their ventilation systems. The Las Vegas Sun explains that “there are metal devices the size of breadboxes attached to the ventilation systems of nearly every Strip resort. The boxes vaporize highly aromatic and shockingly expensive oils into the ducts, where the airflow dilutes and distributes them.”