Someone who has smoked for many years and is short of breath is most likely hypoxic and should get treatment soon.
Hypoxic is a someone who is in a state within which oxygen isn't out there in spare amounts at the tissue level to keep up adequate homeostasis; this will result from inadequate oxygen delivery to the tissues either because of low blood provide or low oxygen content within the blood (hypoxemia).
Hypoxia typically needs medical treatment instantly. Your tending supplier can talk over with you concerning the underlying cause and the way to manage it going forward. In some circumstances, drive resolves once the underlying condition is treated. In these cases, the requirement for supplemental gas goes away.
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