I chew on the stand and feel it has no effect on my hunting. Our breath is a major source of odor. I laugh at ppl who buy a full set of sent lock clothing then do nothing about the smells from their mouth. If you are up wind of the deer; they will smell you. If you are down wind; you will smell them first.
Here are my keys. I do not spit so when I am done with my pinch of snuff I simply place it in my piss bottle and screw the cap back on. I set all my stands facing north and at least 100 yards from the food plot. All my stands are much higher than the field I am looking over. I never access a stand by walking across or near a field.