Well, I've watched this thread from a safe distance for 2-1/2 years now, and finally voted. I voted "Didn't wear a helmet, but now do". Reasons:
- When I bapped my head on the concrete in 1991, I did not enjoy the concussion
- When I bapped my head on the concrete in 2003, helmeted, I enjoyed not having the concussion
I'm not clear on the science of why or why not or what type or whatever, I'm just sayin'. But I'm not going to try to pass any laws, either.