Just because you don't think you've had organ scarring doesn't mean you haven't. The difference is that most people don't worry about organ damage that is mostly negligible and never talked about. You don't automatically get diagnosed with a chronic disease in the presence of the smallest amount of scar tissue on any one organ and with (one number I found suggesting) 40% of industrial nations deaths having fibrosis as a contributing factor, you can bet that many people have organ scarring that is negligible.