I will say again, my son and I have sat in our shooting house and heated up hot chocolate and vienna sausages and ate them with deer 25ft away from us. Maybe they smell us but it is little enough that they dont worry about it. As soon as we open a window or door they wind us. Seen it happen a hundred times. So maybe they do smell us maybe they dont but as long as we have the windows and doors closed they stay in the field.