There's no question that modern teens are more comfortable with cellphones than earlier generations, but there's now evidence to suggest that some of them are a little too comfortable. A recent study shows that some teen texters exhibit the same compulsive behavior you see from gamblers, including the inability to cut back, sleep loss and lying to cover up habits. For the girls in the study, this frequently translated to poorer grades at school (though they still fared better overall than the boys). The quantity of texts didn't affect the teens so much as their inability to pull away from their devices. Sending just a few messages doesn't matter if your eyes remain glued to the screen, after all.