Primarily it is its low boiling point and hence volatility that enables smell/aroma. There are other factors too.
Aroma chemistry is name for area dealing with scents, their perception, creation and mixing. Aromatic chemistry is name for area dealing with benzene derivatives. The word "aroma" you mention may be related to something different too, depending on the context.
Cinnamaldehyde has a chemical formula C9H8O and a molecular weight of 132.16 g/mol. Its structure consists of a benzene ring with an attached aldehyde group and a double bond, giving it a distinctive cinnamon aroma and flavor.
AROMA
Aroma The smell of the food is called "Aroma". We say, "This food has a good aroma", or we say, "That this food is aromatic!"
"Aroma" is a common noun.
The word "aroma" is a noun. It refers to a pleasant smell or fragrance.
A word meaning aroma with nine letters is fragrance. Other words that also mean aroma are scent, and odor. A fragrance, or aroma, is something you can smell.
An Aroma is the scent which surrounds or emanates from something.
The Aroma of Tea was created in 2006.
The population of Aroma Province is 86,480.
Aroma Café was created in 1991.
Some words that rhyme with "aroma" and relate to nature are: flora, fauna, aroma.