Sounds like "American scientists..."
But to be honest the situation how people are addicted to their smartphones is really sad. All day with nose in the mobile screen. In the car, public transport, on the street. They are a threat to road traffic. And looks like a zombie. Meaningless, infinite scrolling of the screen. And the world around is worth more attention than the new picture of the next child/cat/dress. Who cares.
RE: The harmful aspects of using smartphones