I have tinnitus. I think it is from a noisy rider mower. It had a hole in the head gasket for a couple years and I was careless about earplugs. I also rode my scooter with an exhaust pipe that I was struggling to keep on tight ( header pipe) and that was before the tinnitus became noticeable. Sometimes I forget I have it, so it must not be too bad. There is some hearing loss in that ear. I only hear it on the right side.
42 years on a Heinkel Tourist