Yes,they play a part in my hunts.I luckily killed a buck many years ago who was getting on his feet as the thermal shift was occurring.The first time I saw him he was coming out of his bedding area with the wind at his back and the thermals blowing to his right side.He was traveling down the edge of a ridge that he could look down.He had every direction completely covered.The first time I saw him he was out of bow range and he got a snoot full of me because of the thermals at about 60 yards out.A week later after having rested the stand for 7 days I killed him before he got in to my scent stream from the prevailing wind and the thermals.Both times I saw him was within minutes of the thermal shift.