deer smell all types of odors in the woods,...from camp fires, food sources, wood stoves,tobacco ,weed, fire, diesel from farm equip, car exhaust, chain saws, construction materials, lunch pails, us hunters farting , pissin and shi##netc. Just like all the other creatures in the woods....I think the human smell (PERSPIRATION) is what really spooks them more than anything. Maybe to deer, perspiration is like a predator scent, like coyote. .Just think... deer smell humans then boom... gunshot/ bowshot.After a few seasons they catch on ..thats why there are trophy bucks yet to be harvested.. Movement and noise are more critical in sending a danger signals to deer. This is especially true during the hunting season...deer feel, smell , see pressure and there out of there...TRUE??