Artillery crew members who fired thousands of rounds in combat came home plagued by hallucinations and psychosis Could this problem also be affecting civilian gun enthusiasts? Or is the order of magnitude of the exposure just wildly lower compared to the military, even in the most enthusiastic?
The difference between small arms and artillery is absolutely enormous. Handguns and rifles make loud popping noises. Exploding artillery shells are concussive bombs that produce brain rattling blasts.
It seems the WW1 doctors got it right the first time.