Why do people buy oxygen?

Could you elaborate on the reasons why individuals opt to purchase oxygen? Is it for medical purposes, such as treating respiratory issues or supporting patients with chronic illnesses? Or perhaps, is it for recreational activities, like diving or high-altitude climbing, where oxygen supplementation is crucial for safety? Additionally, are there any other factors that drive people to buy oxygen, such as environmental considerations or personal wellness trends? Understanding the motivations behind this purchase decision could provide valuable insights into consumer behavior and market trends.