'Stitchbitch' (ex-A4G?) has the good SOP. Here is an oldie but goldie story about 'the best hangover cure EVER!' Pure Oxygen under Pressure.
Perils of Pure Oxygen Under Pressure [5 page PDF about LOX and acceleration atelectasis attached [Kiwis solved LOX problemo]
“...Another prominent influence in Paul's AirPac world was a female aviation physiologist at Alameda. He later learned that she was the first female aviation physiologist in the Navy. "A bunch of us were sitting in a briefing room awaiting the lecture on the use of oxygen equipment when this really attractive brunette walked in. We all sort of straightened up and paid attention. The young lady began the lecture by asking, 'How many of you smoke?' Several hands went up. Then, 'How many of you smoke while flying?' Some hands remained raised."
Without a further word, the physiologist strode to a console, inhaled deeply of 100 percent oxygen from a tank and produced a cigarette lighter. "This little gal blew a big breath, flicked the lighter and ignited a streak of flame right over our heads that seemed about six feet long," Paul recalls with a grin. Then she said, "That's why you don't smoke in the cockpit."
"Believe you me – she made her point! I thought, 'Hmmm... she's all right.'...”
‘Where Are They Now? Paul Gillcrist’ by Barrett Tillman
http://www.tailhook.org/Gillcrist.htm