AirPods Pro & Tinnitus

I love my Airpods & mainly use them with my iPhone 13 to listen to books on Audible whilst running, cycling, skiing or travelling - but I have developed constant tinnitus since starting to use them. I’ve had my ears examined and done a hearing test but all is normal, so there is no other cause. I’ve never had a problem with other types of headphones & don’t play the books at a high volume. Is it true you’re only supposed to listen through Airpods for an hour at a time? If so, what is Apple doing to get this message out to customers & warn about the risk of developing constant tinnitus? I wish I’d been told of this risk before buying and using them because from my research, lots of other users are also now suffering.