Well . . . not technically. The BBC has an interesting article about people damaging their thumbs by using their Blackberries too much. If you’re not sure what a Blackberry is, it is a wireless device that can provide phone, email, Internet, organizer functions, and access to your library network.
Apparently, the thumb is different from the other fingers of your hand, in that it is not supposed to be used as much. Repetitive use can damage it, causing osteoarthritis and repetitive strain injuries.