* Gases have no fixed shape or volume, meaning they take the shape and volume of their container. They are also highly compressible. Because of their low density and weak intermolecular forces, gas molecules have a lot of freedom to move around and don't interact strongly enough to create taste or smell.

* Liquids have a fixed volume but take the shape of their container. They have stronger intermolecular forces than gases, leading to some interaction and potential taste or smell.

* Solids have a fixed shape and volume. Their strong intermolecular forces often lead to distinct tastes and smells.

Exceptions: Some gases can be highly reactive and cause strong sensations in your nose and throat, but this is more a chemical reaction than a "smell" in the traditional sense.