You know, there are men in mental institutions because of this subject!
I could type 20 pages, rofl. I have gone thru the bathing in the AM with baking soda and going completely as scent free as humanly possible hunts, with no deer?
I have had the "screw it" hunts, where you decide it's just too much trouble and got deer?
I have done the inbetween thing and just spray myself with scent sheild and have got deer, and not?
I have done all kinds of attractants and cover scents, also with mixed results.
I shot a solid 8 point whitetail at 20yds with a cigarette going. Freaked me out!
This all from ground stands by the way. I rarely use tree stands.
The one common denominator with 80-90% of deer I have taken has been, silence and no movement. I have noticed that more times than not, deer have approached me when I am in one of those day dreaming modes and have been in starring into oblivion for 30 minutes without realizing it, haha. All of the sudden, Boom, there is a deer!
Shhh, don't tell anyone but, the largest deer I have taken, a record book deer, was when there was no movement and total silence. I had on jeans and a longsleeve shirt, which I never hunt in, but it had stormed all of opening day and at 3PM cleared. So, I went to the woods as I was, with a gun, and sat down in front of a huge boulder and feel asleep. I woke in about an hour to a sound, opened my eyes and saw mossyhorns at 15 yds walking toward me. The rest is history. It can also be said that you are breathing very slowly when like this and putting off less scent but, I believe it more silence and lack of movement.
Deer are used to smelling humans, especially during gun season. I believe that if you try to do a decent job at containing scent, you will usually be ok if you follow the other rules! I actually subscribe mostly to the "least obtrusive theory." The more natural the smell the better. Too many of these cover and attractant scents all over the woods and the deer are smelling stuff they don't normally smell, I don't care how natural the bottle say's they are! The key is not to alert them of anything at all!
One other thing, the one "scent", if you will, I have had more success with than anything I have ever used and doesn't seem to be alarming to the deer for some unknown reason is Vanilla extract or pure Vanilla. There's a little hint for ya.
Movement is one area treestands do help out in! But as far as scent goes they only help in the later hours of morning and early hours of the afternoon. The cold morning and evening air pushes scent downward and actually, the other hours usually have a breeze that swirls scents around regardless of where you are.
Ooops, got a novel going.