20 fascinating facts about our sense of smell


You can smell as fresh as a daisy every month and your scent cells are renewed every 28 days, so every four weeks you get a new “nose”.


Studies show that 75% of emotions are triggered by smell which is linked to pleasure, well-being, emotion and memory – handy when you want people to buy your products. One of the most evocative smells from childhood is crayons. A survey found that 85% of all people remembered their childhood when they caught the smell of  Crayola crayons and the newer crayon-scented coloured pens.


The sense of smell gets bored easily. When entering a bakery or florist you are very aware of the aroma but by the time you reach the check-out you will no longer be able to smell the different aromas around you.


The sense of smell is the first of all our senses to develop. Even before we are born, our sense of smell is fully formed and functioning.


A woman’s sense of smell is much stronger than a man’s. It is heightened even more in the first half of the menstrual cycle and reaches its peak when she is most fertile.


The sense of smell peaks when we are in our late teens and begins a gradual decline. People who have an impaired ability to smell, and therefore taste, tend to follow diets that are less healthy.


You can smell things better in the spring and summer, due to the additional moisture in the air. For the same reason, it is also stronger after exercise, which also increases the moisture in the nasal passage.


Humans have five to six million odour detecting cells but that is nothing compared to the animal  kingdom. Rabbits have 100 million and a dog 220 million.


Forget fingerprints or CCTV, perspiration could be the big thing for crime busting in the future.  Israeli chemists say the food we eat, drugs we take, gender and even state of mind, all combine to make each person’s sweat unique. Dr Michael Gozin, of Tel Aviv University’s School of Chemistry, and his team are breaking down the components of human sweat as a new kind of ID, saying each person has his or her own chemical fingerprint.


While humans each have a favourite smell, so too do animals. Cats like the smell of valerian, lions a mint smell and camels like the smell of tobacco.


It is not enough now to go to museums to see the past come to life, you have to smell it, too. At the Jorvik Viking Centre, a stench is pumped inside to give visitors a true simulation of what the Viking era would have smelled like. The museum attracts more than 14 million visitors a year who visit to experience smells such as a Viking toilet and village.


The human brain can process roughly 10,000 smells in an area the size of a postage stamp, each triggering a neural response.


The smell of a new leather jacket or pair of shoes makes everyone happy. But a new car smells best of all. An artificial “new car smell” is sprayed inside cars that lasts for six weeks. And while not everyone can own a Rolls-Royce, at least you could get the smell. The car manufacturer reproduced the scent of the 1965 Silver Cloud and sprays it under the seats to recreate the smell of a classic Roller.


As it turns out, the phrase wake up and smell the coffee is more true than you would imagine.  When you are asleep, your sense of smell shuts down. You can smell only the coffee after you have woken up.


Your sense of smell accounts for 75-95% of the impact a flavour has. Without being able to smell the difference between onion and potato, it’d be difficult to tell them apart.


Sport can use the power of smell. During baseball’s World Series of 2009, the Tampa Bay Rays ditched stale hot dogs and beer in favour of a scent dubbed “citrus burst” to flood the stadium.


People who cannot smell have a condition called anosmia.


All over the world, hotel chains have devised their own signature aromas. ‘Sheratons’ smell like fig, clove and jasmine; Westin lobbies go for white tea while the Four Points venues smell of cinnamon. Montcalm in the UK have used our expertise to create their own ‘scent butler’ where guests can choose what smell they want their room to smell of!


The way we smell plays a large part in who we are attracted to. In one study, a selection of women wore men’s T-shirts and were more attracted to the bodily scents of men who had a different type of gene section.


Spare a thought for the poor people who suffer from cacosmia. Even a bunch of fresh flowers is horrible as they perceive all smells as something revolting, such as putrid or vomit.