I once read a quasi-scentific article that said; when exposed to contaminants (sweat, chemicals, various odors, etc,) for extended periods, activated charcoal had a working life-span of approx. 40 hours.

As for deer walking close; it has happen to me many times in my 39-years and I do not wear anti-scent clothing.

What I want to know; how do you cover your face, eyes, nostrils, mouth, where body odor and breath also emit from?