I would not say all scents do not work.. In fact far from it.. Bears are territorial and will fight off rivals.. With the right scents you can get a bear to wander into you and a tree stand would be best suited for a situation like that.. Getting you and your scent off the ground will help plus it would allow you to see better down threw the thick growth bears like to travel threw.. So if there is bears in the area you are hunting you may want to try setting in a tree stand and scenting for them. Make sure your scent is covered up though as bears can smell real well.. One of the scent used up here is this one.. But, you can shop around the net and find which one you would rather get..
http://www.huntingnet.com/forum/memb...bear-scent.jpg
I hope it helps you and good luck..