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[–]tvk30nctqf 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (2 children)

Your lungs only reponds to CO2 or gasses that are chemical active to either irritate or destroy your lung tissues. If it's relative inert you body won't care it's there.

[–]bobbobbybob 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

you need to slowly lower O2 to make sure your lungs have the energy to expel remaining CO2 without pain triggering