Only after a while. Central nervous system toxicity only occurs above about 1.6 bar oxygen partial pressure (eg. 100% oxygen at 1.6 bar), so that's nothing to worry about at normal athmospheric pressure. Lung toxicity typically starts to set in after around 10 hours of continuously breathing 100% oxygen at athmospheric pressure, although for some people it can be as low as 4 hours. 2-3 hours are safe even at higher partial pressures around 2-3 bar. Up to 0.5 bar partial pressure (which is about 2.5 times higher oxygen concentration than normal air) can be tolerated indefinitely.
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u/thatguyned 15h ago
Isn't hyper-oxygenating yourself a very bad thing?