and I'll say it again.
My mother owned a vaporizer (and probably her mother, too). It held, oh, maybe a cup of water and a teaspoonful of Vicks VapoRub. You plugged it into an electrical outlet and in a few minutes the heating coil would boil the water and it would put out a huge cloud of highly aromatic steam and water vapor. You would put a towel over your head and use it to capture and breath as much of that vapor as you could in order to relieve cold and flu symptoms and help open the sinuses and lungs. I seem to recall she also used it for my brother's asthma medicine. You could buy one (still can, I think) in any drug store.
I have no memory that the FDA was involved in regulating the sale or use of such devices, or gave a hoot.
My 401s and 402s are the modern battery powered, micro-electronic, ultra-miniaturized, personal version of my mother's vaporizer. Why do they (the FDA) suddenly feel they have to be so stringently controlled?