Is being reliant on an oxygen tank permanent?

I mean at some point they die and they don't need it anymore

Not if you keep smoking

maybe in a case where the lungs are healing but thats the rare exception.

i think in most cases once you need it you always need it for the rest of your life

Right after my second open heart surgery I was on oxygen for about three months due to excess fluid (actually blood) left in my in my chest cavity squeezing my lungs and preventing me from being able to breath on my own without the help of oxygen. After they drained all the fluid (blood) from my chest I was able to come off it.

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I've never seen or heard of a situation where a person no longer HAS to use a tank.

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If they need oxygen to live, and then die, they no longer need it.

Possible if you get a lung transplant that's perfect for copd or cystic fibrosis

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What type of surgery did you have.. Valve? CABG?

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Replaced my mitral valve with a mechanical one and double by-pass. One week later they opened me back up because They had my Coumadin dosage too high and I begann bleeding internally from my heart. Basically bled out, got revived, and that’s why my chest was full of fluid/blood. They put the drain tubes back in )like three of them I think) but I still had several liters hey had to drain using the needle and vac pump in the back. Can’t remember the officially name they called it. Hurt like shite though.

No it is not permanent, neither is breathing .

There is however a close direct relationship between the two.