Do you use supplemental oxygen? And if so, do you use it safely, according to your oxygen supply company's instructions?
Under normal circumstances, oxygen is a safe, non-flammable gas. However, it does support combustion, meaning that if it comes into contact with a flame source, it could lead to fire.
If you have no clue how to use oxygen safely, or you just need a few tips to refresh your memory, check out the following: