This may not be your standard "accessory" but I bought a neti pot last week. I can honestly say it's made a difference in my retrohaling. The added bonus is that it gets rid of that cigar smell I have in my nose for hours from retrohaling. If you haven't tried one , it couldn't hurt. It clears me up and makes my smokes that much more enjoyable.
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This is the one I use. Been using one for years. It's basically a douche for your sinuses!!!!