How bad can one person smell, and what was their scent?

I entered a re-sale shop behind a group of 3–5 people today. Thought nothing of it.

When I got in the store, the smell of cat pee/mark was overpowering. Enough to make a person’s eye’s water. As I moved through the store the smell was ever-present, but stronger then weaker.

I thought maybe the store had taken in items that were from a (We’re asked not to use this term) Crazy Cat Lady house.

But no. By the time I got to the front of the store the people that entered ahead of me were leaving, and the air was clear.

Can you imagine such sensory defeat that you didn’t notice?