Important but unsettling topic. I know I've done damage to my ears over my 39 years and would self-diagnose a low-grade case of tinnitus in myself. I've recently taken to using those Etymotic 'musician's' earplugs at jams. None of the guys I play with wear any ear protection. While these plugs are better than normal foam earplugs, unfortunately, I do find that they take a lot of top end off -- not a good thing when I want to hear my guitar amp. But it isn't too bad. I guess I never thought too much about how I abuse my ears through the use of earbuds and headphones. Thanks for pointing my attention to this... I will be more mindful.
I wonder if it is worth investing in some custom earplugs.