How big of a role does smell play in liking someone?

CarelessWhisper
I was sitting down when some girl I had seen before but never talked to came up behind, rested her head on my shoulders, and then proceeded to sniff me. She said she liked the way I smelled, all I could do was laugh. I thought she was messing around but she kept hanging around me, ten minutes later she was sitting next to me telling me her life story and wondering about mine. I realize this was over the top and not everyone acts on impulses, but what goes through a ladies mind when she encounters a guy who smells good to her?
How big of a role does smell play in liking someone?
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