I've had a biologist friend of mine actual wizz in mock scrapes and will have bucks actually use it. I was also at a seminar by the Wenzels (sp?) and they stated in all their years of hunting, human urine has never spooked deer. Now, I seen and heard of guys who smoke having scent control issues. I do chew from the stand and while I've had deer pick up on the scent they are more curious than spooked, although leaning over to spit will get you busted more often than not.