I've only been busted once that I know of because of scent..my other times were movement...
The scent one..no doubt..I was in a climber...the tree was so big the entire tree concealed me..The biggest FL buck I've ever seen came out on a "can" call..He walked within 20 yds..sTOPPED and Stomped his hoffs into the ground..waited about 5 seconds and split.
The other times.very poor stand placement on my part..to close to the game trail..deer walked right up on me before I realized it.
I don't believe in scents myself..would never buy any..and generally hunt th ewind..HOWEVER..if I meet someone in my area that is scoring consistently I will ask them what they are doing..all that I have asked use cover scent