[tjradcliffe]

Oxygen is not flammable (neither is fluorine... every other element is, in the sense that it forms stable compounds in exothermic reactions with oxygen.)

Oxygen is, however, fairly toxic (2 atmospheres partial pressure starts to get pretty dangerous after relatively short times.)

[bmelton]

You are indeed correct, and had I taken more care, I would have stated that oxygen encourages flammability... which is still not entirely correct, but closer.

Thank you for the correction.