Researchers have demonstrated the existence of an olfactory receptor in pigment-producing cells in human skin, the so-called melanocytes. They have shown that the violet-like scent Beta-Ionone can activate the receptor.
That smell of freshly cut grass makes me think of Friday night football in high school. The smell of popcorn and cigar smoke reminds me of the stadium. The cutting of the grass reminds me of the August practice.