Scents and things of that nature, if coming from something supernatural (angels, spirits, etc) are often very personally connected to the one doing the smelling. For instance, I smell carnations strongly when my mum is around... cigarette smoke for my dad.
So I would ask myself if there's a minty association with someone who might be wanting to visit you.
Of course, random visitors can also bring strong scents with them. Mint would be a recognizable scent and something to catch your attention as it's not in a usual place to smell mint... I think someone, whether you know them or not, is wanting to catch your attention.
If you don't feel frightened of it, try saying hello.
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