American teenagers sent and received an average of 2,272 text messages per month

This is the average for the fourth quarter of 2008, according to the Nielsen Company. It`s almost 80 messages a day, more than double the average of a year earlier. The rise in texting is too recent to have produced any conclusive data on health effects.
But the phenomenon is beginning to worry physicians and psychologists, who say it is leading to anxiety, distraction in school, falling grades, repetitive stress injury and sleep deprivation.

Are your teens texting too much? What measures did you take?