Robert
                    
                    
                    
                    
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                        I experienced a mild brain concussion, and skull fracture.  How many years must go by before I know I will not experience more effects from the injury? I was advised that it requires ten years before one becomes "clean" from smoking cigarettes.  Is there a number of years that I am required to meet, before I know I will not be effected from the head injury? Robert.