am on disability for a on the job injury, have now been diagnosed with copd and am on oxygen 24/7, will this give me more disability?

Yes COPD is eligable for disaability.check out www.emphyasema.net

It all depends on the circumstances of the on the job injury and who is paying the disability. If you are receiving money from the insurance company, you will not get any extra unless it's a direct result of your original injury. If you are receiving disability payments form the government, then take the new information to the social security office and they can give you a more specific answer as to how much more if any you can receive.