Ok, you asked, lol
I dont believe they can "smell" such but am PURELY convinced, and there are some articles around stating other examples, when they can "tell" things...like you are after them LOL.
Somehow, someway...if I am not hunting them, I have often had REALLY close encounters with them and never understood how they could NOT have seen me. It was only after several years of repeats that I realized they DID see me but were just not alarmed.
Off the wall that it may seem to many, this process even seems to be apparent to me when I am "only buck hunting" on certain days of the year or when I "think" I have a certain buck nailed down.
Other bucks and does just dont give me much attention, even downwind when I'm sitting on a bucket in the woods! See me? Maybe not. Smell me? oh yeah. Sometimes I've even had em come looking FOR me...and finding me of course but never really do the full stampeded exit but rather just walk off repeatedly looking back at me.
Sit me in that same spot later on TO shoot one of the does.......har har har. I git er done but it isnt a no brainer, "automatic" hunt....but we don't like them anyway. lol
For me, I'm convinced they can sense "something" when the hunter is about and many whom hunt with a camera have repeated many such stories as my own over the decades that "something changed" with the camera was traded in for a weapon of choice".
2 cents
God Bless
(PS......"think happy thoughts, Think happy thoughts!" lol)