You mention that "people have been breathing these things in for years with less health risks that dying from corona virus.". This means that there are also health risks to breathing in Copper Iodide nano-particles.
A cure for the SARS-CoV-2 disease is likely to have no health risks for people who do have weak immune systems, such as newborns, very old people, people who have underlying health conditions, or pregnant people.
Also, there is the chance that Copper Iodide might also eradicate probiotic(good) bacteria and Vitamin K-producing bacteria or even human cells or platelets, and might even clog up the capillary blood vessels. So these inactivating properties may also apply to good cells as well, and that is bad for our human health.
Also, when this is absorbed into the cell, it can alter the DNA and make mutations that can cause cancer and other reproductive harm!
Heavy metals and their bonds are all generally considered toxic to the body and that is fact for a reason. Even though Copper Iodide may cure the Corona-virus, who knows what the long term consequences of this are, maybe chromosomal diseases, color blindness, conjoined twins, severely weak immune systems, who knows?
Also, there is already copper in the body. Having more Copper upsets that balance and causes a chain reaction that may lead to severe health problems or even death.
The problem with copper in the lungs is that it is copper in the lungs. This could cause lung cancer and other problems, which makes the lung problem even worse, when we already have COVID-19 infecting our lungs already.
So, I do not think this is likely to be a successful measure for severe patients. Plus, severe patients have weak immune systems of course! Copper and COVID in the lungs is too much, especially for the oxygen that they need. This would decrease the oxygen supply and might kill them.
Manufactured nano-particles are also likely to include other byproduct chemicals in them. These byproduct chemicals are likely to cause harm, including cancer.
Also another problem is that there are ions in the blood stream, including carbonate and bicarbonate ions, which are negatively charged. The added Copper Iodide nano-particles would dissolve into a positively charged Copper ion and a negatively charged Iodide ion. The new Copper ion would bond with the other ions in the blood plasma, which would temporarily form Copper carbonate and Copper bicarbonate. Are these chemicals were what you intended to be in the blood stream? I do not think so. So, this Copper Iodide poses an probable indirect risk to our human health.
My suggestion is that people should consume natural foods that contain a considerable amount of copper such as cocoa beans, winged beans, cashews, squids, and sunflower seeds instead.