Right now for me, and this may sound weird, but it is the Build A Bear strawberry scent you can get put in your plushie.
Not because I frequently went to the Build A Bear Workshop as a kid. I only recently discovered their strawberry scent as an adult. But the scent reminds me of when I was a kid and I would play with my Strawberry Shortcake toys and it had that sweet strawberry scent.
Also, vanilla is always a classic nostalgic for me as well.
But what about you? What’s your favorite nostalgic scent?
Dad did a lot of woodworking, so for me it’s the smell of being in a woodshop around a lot of sawdust. Very nostalgic and comforting.