Is sodium chloride really odourless? If yes, what do I smell?
Since odour is generally coming from vapour / gas form of a material, and NaCl has zero vapour pressure, it should be odourless.
However: 


Moving around solid materials, dust, small particles can fly around that can be dissolved in the nose and interact with the odour sensors. 
You almost always have something else together with salt. And if it is not pure, you cannot be sure what makes the odour, the salt or the impurity. Eg. sea salt often contains remains of algae.