No, Oxygen is very flammable. Oxygen it self is not flammable in any way; however, it is an oxidizer which means if a fire is started it can very rapidly accelerate the speed at which the fire burns as well as creating a much hotter fire. Think in terms of oxy/acetylene cutting torches, the oxygen it self will not ignite without the acetylene and the acetylene burns at a temp that is too low to cut through metal without the oxidizing agent Oxygen.
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Smoking cigarettes is mainly dangerous to your oxygen tank, your lungs. Do not worry about those oxygen tanks made of steel. Take care of the most valious oxygen tank that God has given to you by not never smoking throughout your unique life.
The oxygen tank cannot catch on fire because oxygen itself is not flammable; it supports the burning of flammable materials. You do, however, stand a high risk of starting a fire. The concentrated oxygen in an oxygen tank makes it easier for a fire to ignite and will allow a fire to burn hotter and spread faster. So if you are smoking while on oxygen you are running a great risk of setting your house or yourself on fire.