I think this problem should be right next to alcohol, smoking and resistance against antibiotics as being one the most dangerous health issues of the near future.
My mum hasn't slept a decent night in the last 20 years and a friend's sister declares rather to be deaf than to have to live with tinitus one more day. Apparently 10-15% of the people suffers from this disease, 40% of all musicians claim to have problems to some degree...