Hello my name is, uh, wait. The problem with trying to smell gravity is that we have all very quickly become used to the smell, like when you're painting a house. By the end of the day you get used to it. To truly come to the answer to this question we would have to find some way of asking astronauts who spend days in weighless conditions if they smell anyting weird when they come back to Earth. That smell would be gravity.
Gravity acts the same way.
Since you smell it all the time, you don't realize it is there. I did this and found out that gravity smells like peanut butter. Which coincidentally is what the bottom of a full swimming pool smells like too. Gravity smells like my grandma's basement.