Adolescent smartphone use is positively associated with mood, according to a study published in PLOS ONE. Megan Moreno, MD, MPH, and colleagues explored the relationship between smartphone use and mood among 253 participants aged 12-17. Adolescent moods were positively associated with smartphone use ( b=0.261), and mood was positively associated with the length of phone use ( b=0.100). During phone use, participants also reported significant changes in mood, such that moods before phone use were significantly lower than moods during phone use. There was a positive association between change in mood and length of smartphone use ( b=0.097); participants with a larger change in mood were more likely to report longer length of use. “Using real-time, in situ measures of adolescent smartphone use and mood, this study found that adolescents report better moods when using their phones and report mood improvements during phone use,” Dr. Moreno and colleagues wrote. “This finding may suggest that adolescents use smartphones for mood modification, which aligns with an understanding of smartphone use as potentially addictive behavior.”