Nope, not something that can be used while driving. Or shouldn't be used.
Mine was battery portable, the Nickel something battery having short life span during treatment. I dont think it heated. I think my mix was albuterol steroid and a surfactant to loosen the phlegm. Couldn't use in driver seat, had to be passenger or banged head against wheel if cough fit ensued. No way I would try if was driving. Coughing fits were violent though never saw dark blotches. Would still cause to drive of the road and down a mountain.
I didn't need mine often, but driving from Green River WY to Vernal UT involved going through Flaming Gorge Recreation Area, 2300ft change in elevation. Before hitting switch backs, sometimes needed to stop in a pull out for breathing treatment. Similar for Ouret Pass, CO.
Eventually got acclimated to WY weather and climate, and surfactants did their job, no need for nebulizer anymore. Being from Texas Gulf Coast, heavy smoker, working in oil field coupled with super dry air. Yeah, deck was stacked against me but I played the game regardless. Switching from cigarettes to vape on dr advice probably biggest factor.
Search Amazon for battery portable nebulizer. Mine was mouthpiece only, in oral and out nasal, very boxy. Measured about half length of carton of smokes. Was tempted several times to color case brown and put a Pall Mall filterless logo on it.
~SD