Oxygen by itself is dry and treatments in excess of 4 hours can dry ones lungs. Most oxygen party bars humidify the oxygen by using aroma scented humidifiers when dispensing the oxygen.
Oxygen at very high levels and over a long period of time can be toxic and very harmful to one’s health. If one was to receive high levels of oxygen on a daily basis, ones lungs will adjust to the higher oxygen content and one can find themselves short of breath when they are don’t have oxygen. This is similar to traveling to a higher elevation where a normal person will easily get winded until their lungs adjust to the lower oxygen levels. For this reason we do not recommend daily use of recreational oxygen greater than 20 minutes a day.
The reverse of this effect is why athletes train at high altitude and then compete at lower elevations when possible. Some athletes sleep in an oxygen deprivation tents to increase the capacity of their lungs. Their increased lung capacity enables them to absorb oxygen faster while competing and provide them with a competitive edge.
Some people are suffering from COPD and can easily become dependent upon excessive oxygen and lose their natural tendency to exhale their exhaust gases. These people are generally on controlled medical oxygen and under a doctor’s care and they are aware of their delicate situation. Ten minutes of recreational oxygen will probably not have much of an effect on them.