Uncle Buck, The problem with something that's on your bow is that it limited to what the wind is doing right next to you. It could bouncing off of you, or the trees directly around you. Or, it could be getting blocked by those as well.
Puffers or better yet something riding the wind a bit will really show you what the wind is doing out away from you, and what YOUR scent is really doing....
Del, If your deer can see a tiny shot of powder smoke, I'm sure glad I'm not hunting down there! That's some amazing eyesite!! :eek: