We have some mint growing in a flowerbox on the window sill. When Mersina was a tiny, I would distract her from any falls and scrapes by taking her to the mint and letting her play.
She didn’t show any signs of recognising that it smells any different. Yesterday I took her to the mint again and touched some and then put my hand to her nose. She seemed to smell it. She then touched the mint and put her own hand up to her nose.