Yeah, what is funny is all the people denying they do this seem to have missed the point that it seems to be an unconscious behavior, so of course they are not aware they are doing it.
I caught myself doing just this the other day because a workman from my job shook my hand, and I noticed a weird scent, like he had been melting tar or something. I hadn’t consciously decided to sniff my hand, but once I smelled the odd scent I noticed that I was doing just that, as soon as he left the room.
This video study of dating-age adult men and women interacting at a “bar” mixer set up by the researchers will educate and creep you out with all the body language indicators that we men are clueless about.
Body Language - Indicators of Interest (IOIs)
https://www.youtube.com/watch?v=SBOtj1RmaUE