I am a firm believer that deer will be alerted to any smell that they are not used too, period.
Or any smell that is out of the ordinary, like using Doe estrious during Sept. etc...
I try to remain as scentless as possible with no manufactured cover scents and of course employ the old faithful, wind tactics.
The only cover scent I will use, is after I have gutted my deer, if I am lucky enough to get one, is the Doe or Buck urine from their bladders or the hawks from a buck.
I'll freeze it immediately into a few seperate baggies and grab as needed.
I've recently read, and makes sense, that deer can smell the earth from being disturbed by larger human feet, verses smaller deer hooves.
Example: A size 10 boot, per square inch, is far bigger than a mature deer's hoove. Of course to top it all off, we can not move throught the woods like Tonto or a sleek deer!