New York: Excess use of smartphone and other devices may lead to attention, behaviour and self-regulation problems for adolescents already at risk for mental health issues, warns new research.

"Also, on days at-risk adolescents use technology more, they experience more conduct problems and higher ADHD (attention-deficit/hyperactivity disorder) symptoms compared to days they use technology less," said lead author of the study Madeleine George from Duke University in Durham, North Carolina, US.