i have been on supplementary oxygen for over a year and a half since i had lung cancer. not to get into a lot of detail, but i had many complications and have had decondioning. i am slowly but surely building strength with exercize. i have asked my dr but he is vague and doesn't want to give me any false hope. i have a monitor for my blood oxygen saturation. any tips from people who have done this or any helpful websites. i am determined to get better. thank you for your help in advance. amanda,thanks. what about... how long to leave o2 off; does this strenthen lungs? your answer is like my dr.'s; must be right but not quite what i mean.