Just a gimmick the Indians came up with...
I did a search, years ago, regarding Indians and smoking up... Only found one little piece written about a tribe in Oregon that may have used smoke as part of their pre-hunt ritual. When I was selling 'em, I heard "Oh yeah, that's what the Indians did". Funny, seemed every one thought that was an indian thing to do, but no one could show me where they had read it or heard it. Ha! I wasn't about to tell anyone any different, since a lot of folks seem to think the Indians were the only ones able of killing deer.

Another favorite; "Deer smell smoke and know man is in the woods"... yeah, Mom read BAMBI to me too, I just didn't learn my hunting tactics from it.
Oh BTW, I think it works too...