Does atoms and molecules explain everything?

We know atoms and molecules make up matter. However, do we really understand what elements in matter cause substances to smell? If any particular arrangement of matter cause things to smell, what is given off from it to stimulate our olfactory senses. And if something is really given off from the matter, does that result in weight loss of the substance or does it alter the substance chemically. There seems to be not much available on google relating to these questions. Can somebody answer?

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