I do not own one, but will say this, unless you find a way to totally recycle your breath you will emmit human scent, just less of it, I am sure they help. What part of your body produces the most odor? Your mouth, no matter how well you brush your teeth, you can not stop the scent from your breath from smelling.

The Tazman aka Martin Price
Founder and President of
Virginia Disabled Outdoorsmen Club