San Diego State University professor of psychology and author Jean Twenge has claimed that smartphone usage is having a radical impact on both the behavior and mental health of U.S. teenagers.

The arrival of the smartphone has radically changed every aspect of teenagers’ lives, from the nature of their social interactions to their mental health […] Rates of teen depression and suicide have skyrocketed since 2011. It’s not an exaggeration to describe iGen as being on the brink of the worst mental-health crisis in decades. Much of this deterioration can be traced to their phones.

Far from being the usual generalized complaint about teens spending too much time staring at their screens, Dr Twenge has plenty of hard data to support her contentions – made in The Atlantic, the magazine in which Laurene Powell Jobs recently bought a majority stake

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