The smell report the human sense of smell although the human sense of smell is feeble compared to that of many animals it is still very acute we can recognise thousands of different smells and we are able to detect odours even in infinitesimal quantities. The sense of smell is the oldest sense some of the most pleasant or pleasurable scents include vanilla cinnamon crayons and cookies a decreased ability to identify scents may predict death . One of the oldest beliefs about human perception is that we have a poor sense of smell not only is this a general belief among the public but it appears to have a scientific basis recent genetic studies show a decline in the number of functional olfactory receptor genes through primate evolution to humans. Smell is a very direct sense in order for you to smell something molecules from that thing have to make it to your nose everything you smell therefore is giving off molecules whether it is bread in the bakery onions perfume a piece of fruit or whatever
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