Think about it!

Credits:
1. "Concussion is serious. It can lead to long-term brain damage, with possible links to dementia, Alzheimer’s and depression. At worst it can be fatal. No message could be stronger." ~ Steve James, The Telegraph, 1 June 2015, http://www.telegraph.co.uk/sport/rugbyunion/international/wales/11644332/Rugby-union-is-at-last-using-its-head-over-concussion.html
2. "Researchers with the Department of Veterans Affairs and Boston University have now identified the degenerative disease known as chronic traumatic encephalopathy, or CTE, in 96 percent of NFL players that they’ve examined and in 79 percent of all football players. The disease is widely believed to stem from repetitive trauma to the head, and can lead to conditions such as memory loss, depression and dementia. ~ Jason M. Breslow, Frontline, Sep 18, 2015,
http://www.pbs.org/wgbh/frontline/article/new-87-deceased-nfl-players-test-positive-for-brain-disease/
3. "Dr. Bennet Ifeakandu Omalu (born September 1968) is a Nigerian-American physician, forensic pathologist, and neuropathologist who was the first to discover and publish findings of chronic traumatic encephalopathy (CTE) by examining American football players while working at the Allegheny County Coroner's Office in Pittsburgh." ~ https://en.wikipedia.org/wiki/Bennet_Omalu
4. "Chronic traumatic encephalopathy (CTE), a form of tauopathy, is a progressive degenerative disease found in people who have had a severe blow to the head." ~ Wikipedia
5. "It can affect high school players who have played for just a few years." ~ Bryan Toporek, Wikipedia