Each perfume is associated with different recollections and experiences. As you form new memories, older ones and emotions tend to fade. When you try a new perfume, you are trying an odor that has no associations, so it gives you the possibility to make new ones and write new memories.’ Later in life, when you smell something, you are brought back to a specific moment or event. You remember how you feel.’ And she gives the advice that now is a good time to re-access your scent collection (even deodorants, shampoos and shower gels). ‘If it makes you feel good, you keep it. If it doesn’t, you change it,’ she suggests. This process produces nerve impulses which travel to the limbic system, the part of the brain which is most concerned with survival, instincts and emotions. It’s thought by scientists the activity of the nerve signal passing through this region causes mood change by altering brain chemistry,’ says Christina Salcedas, of Aromatherapy Associates London. Our ability to smell ‘…is a window into parts of the brain related to core functions, like pleasure, emotion, and memory,’ agrees Jayant Pinto, MD, author of the study, an otolaryngologist (try saying that three times!) and head and neck surgeon at University of Chicago Medicine.