Which bring us to the question: What is a happy scent? [Charles] Spence wrote a paper on "Sensism," as he calls it, on the benefits of aromatherapy: According to Spence, lavender aids relaxation, roses and heliotrope have a sedative affect, cucumber and green apple help with claustrophobia and citrus has been shown to have invigorating properties that aid concentration and boost spirits. "Citrus is an alerting essential oil and mood enhancer," Spence says.
— From Finding happiness in a bottle — of perfume at the LA Times. The article also includes a round-up of new perfumes for spring 2010. Many thanks to Joe for the link!