Dr. Phil, 
Sadly, this choking game is not new and I'm horrified to have learned as an adult it's ramifications. I am 34 years old and when I was 12 and 13 my friends and I played this "game" all the time. I got so good at it, I could do it to myself while alone in my room. We didn't think it was harmful because we weren't ingesting anything or "hurting" ourselves. It seemed harmless. I couldn't believe it when I learned about it again 22 years later on a news magazine show and then on your show. I am ashamed of myself for being so dumb that I would put myself and my friends in danger. I have two children of my own and will be horrified if they attempted this. I will be very vocal to them in teaching about the dangers of this and other games so they don't repeat the same mistakes I and so many others have made. Thank you for reminiding me of this terrible trend.