Are You Sick Of It

Gallifrey’s atmosphere is 77% Nitrogen, 21% Oxygen and 2% other, which means that it’s similar to Earth’s atmosphere, but it’s a bit thinner. The Doctor needs oxygen as well, but Time Lords have a raspiratory bypass system that allows them to go without breathing for a longer time span than humans.

Most fandoms have some pretty deep canon. The Doctor Who fandom can tell you the concentrations of gas in the atmosphere of the home planet of the main character. DW Fandom > Your fandom

This also means that Earth’s atmosphere gets the Doctor high, because it has double (or triple, I can’t do math, forgive me) the oxygen of Gallifrey. Obviously the TARDIS has an Earth-like oxygen level inside of it, which can explain why he’s so bloody hyper all the time.

so are you telling me that the Doctor protects Earth because it’s where he gets his fix is that it

Yup. We’ve gone insane. 

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