I never have....but I'd pee out of my stand and not worry about it.....lol.

That said....I dip (have one in, now). But I don't dip on stand. "I" think our mouths are probably the MOST overlooked origin of human scent. I use DDW mouth spray and gum-o-flage (and I play the wind, every hunt).

I'm not terribly anal (any more than most serious bowhunters) RE: scent control), but I do pay a lot of attention to oral scent control.