I never used any hand warmers because i felt the oders might lessen my chances but there is very little evidence to suport this. I do however know that using unsented (perfume) soaps and keeping at least the outer garments out of the hunting shack and all the cooking smells have been helpful.
When it comes to an alerted deer, anything can ignite their afterburners!
I use Kirk's
soap only for hunting and its getting hard to find locally. And its all-in-one bath and shampoo! nothing lathers like it in cold Rocky Mountain stream water.