Oxygen and candlelight

I'm periodically sitting in a steamy shower to help a face wound heal. Would lighting a candle decrease ambient O₂?



I would leave the door cracked. Don't know if the CO etc. produced would be clinically significant, but I figure it's possible.



ETA: To those who vape - do you think displacement of O₂ by vaping could make the practice more harmful?

via JREF Forum http://ift.tt/1yIWH0u