Sweet Smell of Success: Simple Fragrance Method Produces Major Memory Boost When a fragrance wafted through the bedrooms of older adults for two hours every night for six months, memories skyrocketed. In fact, participants in this study by neuroscientists from the University of California, Irvine (
Study paid for by the owners of Febreeze. Unreasonably large effect size. Very suspicious.
To be fair, the effect of smell on memory is pretty well documented.