I've used it medicinally. I have chronic pain ( neck vertebrae, neuropathy in feet ), and it's best eaten for this. Curiously, Capsicum chinense seems quite effective, while C. annuum and frutescens are only partially effective. The latter two are also more likely to irritate internally, and afflict me worse. To be effective, a dosage needs to be enough to bring about a bit of sweat.
My first -- and, so far, only -- superhot is "ghost pepper" -- and i can take the heat in small, cautiously administered doses. The effects are wondrous !! On a bad ( just can't function ) day, you can see the difference from the way i walk or turn my head.
I found that habaneros, at a 4-5X dosage work better -- perhaps because ghost/bhut types are not pure chinenses ? (The quality of produce-counter habs went to hell years ago -- flavor, color and analgesic benefits plummeted. Quality vs quantity on the mass market -- it gives us scentless roses and pale, tasteless lettuce.
Obviously, i'm growing my own next year.
There's no end to what medical science might do, given sufficient research, but i do have one prediction that might dissappoint the pharmaceutical establishment : i seriously doubt that any nasal spray/eyedrops/suppositories will offer much repeat business....