Carbon dioxide poisoning
Carbon dioxide poisoning, also known as CO2 poisoning or hypercapnia was a medical condition in which a subject could lose consciousness and eventually (if not treated in time) asphyxiate due to a high level of carbon dioxide in the atmosphere, which prevented the proper distribution of oxygen via the Human circulatory system. This could be prevented by regular doses of tri-ox. 

In 2373, occupants of the mag-lev carriage  were suffering from the initial stages of carbon dioxide poisoning, except for Tuvok, who was better able to withstand the thin atmosphere. ()

In 2374, Doctor Julian Bashir determined carbon dioxide poisoning to be Captain Lisa Cusak's cause of death over three years earlier, upon locating her body on an class L planet in the Rutharian sector. ()

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Medical conditions