What can players do that would endanger their football career and their life?

What a lifetime of playing football can do to the human brain

In the article "Do no harm: Retired NFL players endure a lifetime of hurt In the NFL " talks about football players, and their everyday problems they have to deal with. Also how NFL players in the long run ruined their lives.

 “More than nine in 10 players reported suffering at least one major injury while in the NFL. More than half reported three or more; one in five reported five or more.” This shows that every player risks having big problems in the future. Also having to live the rest of their lives with their injury, because of what football has done to them.

 Chris Cooley, that was a tight end, a two-time Pro Bowler with the Washington Redskins said “If you have brains when you start, you are aware that banging your head into people is not the best thing for your body.” What this means is that young NFL players aren’t thinking about their lives later on in life. They don’t know that they will have some sort of problem after their football career is over.

NFL football players care about one thing and its how much money are they going to get. Players that are making millions only think about the present, they never think about the future, and their lives after football.

Do certain positions in football effect on how long of a career a player can have?