 Of all five senses, smell is believed to be linked the most to emotion due to the brain's olfactory bulb, which detects odors, fast-tracks signals to the limbic system and then links emotion to memories.Recently, many companies have dedicated to sell scent and aromas to different brands and firms in order to enhance their marketing strategy and brand identity.There are about 20 scent-marketing companies in the world, collectively worth around $80 million, says Harald Vogt, co-founder of the Scent Marketing Institute in Scarsdale, New York.