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People on hunting forums talk about how one of the reasons Indians were such great hunters is they ritually danced in smoke before a hunting trip (not to mention living in a tent with a fire in the middle). There is some information on scentsmoker.com which sells a device for hunters to smoke clothes with. There is also a massive amount of speculation, and anecdotal evidence about hunters having animals with spectacular senses of smell, such as deer and pigs downwind at close ranges without spooking when they had "smoked up". I can't give any references other than that though :/