Well when you can't remember to land, your brain is full of noxious poisons and you can't switch your attention easily asking ATC if cleared to land is confirmed isn't easy
Yes it is. If you have been trained properly and operate to a high standard this sort of thing should be second nature when the going gets tough for what ever reason.
Are you sure about that? Are you saying that a pilot who has been gassed, whose motor and cognitive functions have been scrambled by a cocktail of poisons should be able to reason, disseminate and function without fault? You might want to reconsider that statement unless you've had first hand experience of such a situation.
I spoke to a pilot who suffered this. Out of our whole conversation seven words spoken without emotion or exaggeration remain in my memory, "I thought we were going to die". This from an ex-fast jet pilot who had undergone all that entailed including hypoxia exposure, centrifuge training, .......the works.