A guy friend sniffed my hair what does this mean?

For context I had gone to the salon earlier that day for a hair cut. He had complimented the cut and said it looked nice. Later that night when he was dropping me off he went in for a hug goodbye, we hugged but as I was pulling away his hand on my back pulled me in and he took a big whiff of my hair. He asked what they used and said it smelled nice. Whole interaction was a little interesting to say the least, any guy have advice on what his thought process was and if it means anything?

A guy friend sniffed my hair what does this mean?
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