High purity oxygen is not to be inhaled. It refers to the industrial use of oxygen. Industrial oxygen is generally only required to contain oxygen purity， there is no special requirement for other hygienic conditions， etc. At the same time， it also contains excessive carbon monoxide， methane and other harmful gases， moisture， bacteria and dust content is also very high， industrial oxygen is mainly used for welding， gas welding， gas cutting and so on.

At the same time， high purity oxygen also exists in carbon monoxide， carbon dioxide， acetylene and other impurities that are extremely harmful to the human body， once the patient inhales too much， choking， coughing， crusting and other phenomena will occur， triggering or aggravating respiratory system diseases， and in serious cases， it is very easy to cause the patient to inhale oxygen insufficiently and life-threatening.

Not only high-purity oxygen， in fact， ordinary oxygen inhalation may not be a good thing. As early as the middle of the 19th century， British scientists Paul Burt first found that if the animals breathe pure oxygen will cause poisoning， human beings are the same. People if greater than 0.05MPa (half an atmosphere) of pure oxygen in the environment， all the cells have a toxic effect， inhalation time is too long， it may occur "oxygen poisoning".

It is important to know that ordinary oxygen is beneficial to the body， but not the more the better， the oxygen content is too high， oxygen poisoning can occur， and oxygen poisoning is mainly divided into lung oxygen poisoning (similar to bronchopneumonia)， brain oxygen poisoning， eye oxygen poisoning (mainly manifested as retinal atrophy).