A study attempting to discover whether there is a link between cell phone use and brain damage from radiation found that cell phones neither melt nor fry nor otherwise mangle your brains, but the research inadvertently uncovered a previously unknown side effect to frequent SMS: Texting makes you stupid. Or, more accurately, it makes you sloppy.

Intellectual tests were given to 317 children aged between 11 and 14, and it was found that frequent predictive text use causes people to answer some test questions faster, but less accurately than non-text users.

Epidemiologist Professor Michael Abramson of Monash University says repeated predictive texting is training young people to act fast without thinking. "If you're used to operating in that environment and entering a couple of letters and getting the word you want, you expect to be like that," says Abramson.

I totally agree, but I imagine this particular problem will be solved very soon, when predictive text UI all become full keyboard. That's what's going to happen, after all. What the effects of everyone texting on full keyboards will be isn't known, but I predict the human race will evolve with smaller fingers,  like the size of toothpicks!

Source