I know this isn't a meaningful contribution, but if you spin it Bill O'Reilly-style, you can claim it as Harm Reduction.
I always itch and as I said earlier in the thread, I believe it's a Pavlovian response, like, we know the itch is associated with Opioid intoxication, so we grow to really like it. Just like the example of Pavlov ringing the bell and the dogs associated the sound of the bell with food and it caused their mouths to water, with or without food actually being present.
It's always my nose. In all seriousness, I will itch my nose until there's nothing left. It's really not a good thing. I always think I'm just casually itching my nose like you might do when you're not intoxicated, but when you do it several hundred times in a day, it tends to become a problem. I've rubbed so incessantly that I've cause the exterior of my nose to bleed and it's actually pretty painful the next day. Even the wind will irritate it.
If it gets this severe, like in my case, then I definitely feel that an antihistamine might be in order. For obvious reasons, a non-sedating antihistamine like Loratadine (Claritin) might be a good choice or even Dimenhydrinate (Dramamine) which is a combination of Diphenhydramine (Benadryl) and a weak, caffeine-like stimulant 8-Chlorotheophylline.