i was wondering the same exact thing last night... I overdressed for my evening hunt and was soaked in sweat by the time I reached the top of the tree. I took a bunch of layers off so I'd dry off, then put my coat and bibs back on. I had 4 deer circle downwind of me, none busted my scent. I was probably 18-20ft in the air... i dont wear scent blocker etc, only scent spray, and the bodywash/deodorants...

Conclusion? Well i think it depends on the area, the deer, and how used to human scent they are. The deer in my 'urban' setting are used to human scent, so I dont think it alarms them AS MUCH, I've noticed they need a double trigger, like movement added to scent to really get scared.