Smartphones were the leading cause of a major fall in psychological well-being in American Adolescents after the year 2012 according to a new study.

This study was conducted by researchers at The University of Michigan, and was published in the scientific journal Emotion this week.

The study showed that adolescent self-esteem, life satisfaction, and happiness rose between 1990 and 2011, then fell dramatically starting in the year 2012, just as smartphones began to take hold of the planet.

This study was lead by Jean Twenge, a professor of psychology at San Diego State University.

“We found that teens who spent more time seeing their friends in person, exercising, playing sports, attending religious services, reading or even doing homework were happier,” said Twenge.

“However, teens who spent more time on the internet, playing computer games, on social media, texting, using video chat or watching TV were less happy.”

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