I dip in the stand no matter what phase of the season it is... and have never had any negative effects. Since thinking about it, i spit in a bottle and seal it up really quick. but i have spit on a deer's back and it didn't even phase him. (of course he was a little forkhorn w/ doe na-na on his mind!)
my dad's friend smokes in the stand. he's spooked a few b/c of it.
but hey- it's your choice! you see if ur deer are effected by it. people can't say one way either yes or no b/c they don't know your deer! and if it keeps ya awake or "sane" to use tobbacco so be it!