You cant beat a can of Irn Bru out of the fridge.

and yes I'm Scottish........inevitably.

Irn Bru, Catnip for the Sweaty Socks :D

........but even the English must surely tip a hat to the fact that no matter what they do, the US giant that is Coca Cola cannot knock Irn Bru off the top of the fizzy drinks charts in Scotland :smug:

humans have a really complicated carbon dioxide removal system called lungs, why the hell people think it's safe to ingest beats me :cuckoo:

All you need is the oxygen to survive from air,and nothing poisonous mixed with it of course.

CO2 is not poisonous,but it will not support human life in the way oxygen does. The lungs job is to express it with everything else which is useless to us.

All you need it sufficient oxygen so thats its partial pressure is sufficient to allow it to combine with the blood.

Les