One thing to worry about with excessive text messaging is getting carpal tunnel/ tendonitis. I heard it has become a lot more common in Asian countries where texting has been popular for a lot longer.
My cousin can literally hold a conversation with someone and text message at the same time. I kind of find it annoying that her fingers are moving while I'm talking... One day by noon she'd already sent 200. That would definetly put her over the 2500 mark.
