Belly up to the bar and get your favorite — oxygen? That’s right; in some cities you can get a shot of pure oxygen, with or without your choice of added flavors. Bar patrons inhale oxygen through a pl...Belly up to the bar and get your favorite — oxygen? That’s right; in some cities you can get a shot of pure oxygen, with or without your choice of added flavors. Bar patrons inhale oxygen through a plastic tube inserted into their nostrils, paying up to a dollar per minute to inhale the pure gas. Proponents of the practice claim that breathing in extra oxygen will remove toxins from the body, strengthen the immune system, enhance concentration and alertness, increase energy, and even cure cancer