As long as you are aware of the risks and football is something that brings you joy I don't see a problem with playing it. Life is filled with risks and dangerous things of which most are optional. Would you let your kid join the armed forces knowing the risks involved? How about ride a motorcycle or water ski? I've had numerous friends that have gotten concussions or injuries from bad falls on the water while wake boarding. I suffered a concussion and broken arm while skiing in 7th grade. I've been run over numerous times at home plate while playing catcher in softball and been beaned with the ball.-And that is without pads. I was struck by lightning once while tailgating for an outdoor concert. When I look back at all the sports and rec activities I've done over the years high school football was probably one of the safer things I participated in. I would be more concerned if my kid was a lazy ass and sat in front of a TV or computer all day and ate fast food all the time.- the shit we put in our bodies and lack of exercise will have more lasting effects than playing in sports.
I'd let my son play a dangerous sport like football or hockey before I'd let him drink a Monster energy drink or eat MacDonalds on a daily basis.