Bck in the 80's I knew a woman who had Emphysema.. and was hooked on Oxygen 24/7. She could barely walk far enough to get to the toilet.. her whole big farmhouse was left unused, because she lived in the one livingroom, where she slept. She couldn't have the cleaners use any artificial scents in spray polishes etc, and she couldn't have central heating or electric fires to heat the room, because of the dry heat, so she had to have coal fires.. she wore the Oxygen Mas continually, and was very disabled indeed with it... but guess what ,? this woman smoked a pack of cigarettes a day, removing the mask to smoke a cigarette before replacing it back on her mouth.
She said the cigarettes freed up her lungs.. and she could ''breathe better''.. it never made sense to any of us.. but that's what she said.
My ex who was firefighter, almost freaked out when he saw her do this the first time I invited him to visit.. the very sight of all these big Oxygen tanks right next to her, and her lighting up a cigarette almost freaked him out, and he was pleading with her that she can't smoke with all these tanks around.. but of course she continued.. but he wouldn't stay one more minute in the house in case it blew up..
She was like this for about 5 years or more before she finally died in her 50's... and fortunately the house didn't blow up