Does "smell" weigh anything?

Smell is actually loose molecules reaching your nose. Even the smallest molecules have mass and therefore weight.

I would say that "smell" is just something formed in your brain. When a molecule hits your finger, there is no smell. When it hits the inside of your nose then a series of events create a specific signal to your brain which causes that smell. But then this would ultimately end up at the question of "what is reality?", which is way off from the original question.

But the molecules are not smell, smell is a sense. It's a logical idea, not physical matter. So no, smell cannot weigh anything.

Since sent happens to be particals that enter your nostrils then yes, they do. All matter weighs something or at least takes up space.

Yes. Odor is caused by volatile molecules. Those molecules have mass, and, therefore, weight.

What he said