I do agree, the funding for this study;
"Funding for this research comes from the National Institute of Arthritis and Musculoskeletal and Skin Diseases and from the National Institute on Drug Abuse of the National Institutes of Health (NIH)."
I very much agree the money should've been spent towards making it non-addictive, but perhaps it was urged towards the histamine because that's what the people who funded it wanted.
But who knows, overall I still think it's a great leap in opiod drugs, and I hope the next big leap is non-addictiveness.
Also, the addiction from opiates is just the brain's natural way of saying "Well, I don't need to make endorphines and such anymore, it's all here."
It's goign to be pretty tricky to stop the brain for making that decision.
jaurk