 oxygen concentration is in the
fact it is habit forming.  The first inhalation (occurring at birth) is
sufficient to make oxygen addiction permanent.  After that, any
considerable decrease in the daily oxygen doses results in death with
symptoms resembling those of cyanide poisoning.

Oxygen is an extreme fire hazard.  All of the fires that were reported in
the continental U.S. for the period of the past 25 years were found to be
due to the presence of this gas in the atmosphere surrounding the buildings
in question.

Oxygen is especially dangerous because it is odorless, colorless and
tasteless, so that its presence can not be readily detected until it is
too late.
		-- Chemical & Engineering News February 6, 1956
