I had a serious off in 2016. Over the handlebars. Head into the ground, neck bent back resulting in bruising to the spinal cord and long term rehabilitation. Front of helmet cracked with the impact. Mercifully no head injury to compound an already very serious situation. I, for one, believe that small piece of polystyrene had a significant role to play in the lack of a head injury.I believe this is different, there is proof that smoking is bad for you, there is no proof that wearing a piece of polystyrene on your head will have any benefits, the OP for instance didn't sustain any less injuries due to wearing/not wearing said polystyrene.