Hard to describe. I used to smell one way, now I smell another. I tend to notice people's natural scents, so noticed when mine changed.

I suppose the most obvious change was that I now occasionally get a touch of B.O. when I'm working on stuff. I never used to get stinky armpits! It's so icky!

I only tended to get them about once every 18 months or so. Then I got one that wouldn't go away for two weeks. Go figure.