No myths. I just read somewhere that some casinos circulate scents and oils in their ventilation systems "to try to put gamblers in a good mood" from Smartmoney May 2005 article "10 Things Your Casino Wont Tell You." A company called AromaSystems has several casino clients: The Borgata, Mohegan Sun, Barona Valley Ranch Resort&Casino, Bellagio, Mandalay Bay, MGM Grand, The Mirage, Monte Carlo, Venetian, and 25 others in NV.