As a doctor friend of mine said, “A helmet is definitely cheaper than a neurosurgeon”. My other fave is; don’t wear one if you have nothing to protect.

A very good friend of mine went down in a corner not wearing a helmet, hitting her head on the curbing. She was knocked out unconscious and was bleeding profusely from ear and nose and other gashes on her head. She was taken by ambulance to the local trauma center where she remained in a coma for 2 weeks. She had to relearn all basic skills; talking, feeding herself, walking, you name it. She could never return to work after that or ride a bike. After seeing that up close and personal I always wore a helmet. One grave unpredictable life changing event which can happen in a flash is nothing to be so cavalier about, but its your trip.