In 2018 the World Health Organisation formally included gaming disorder in its diagnostic manual for the first time. Nearly four years into running the only NHS gaming disorder clinic, Prof Henrietta Bowden Jones tells Madeleine Finlay about how her team are learning to help those impacted, while a former patient explains how his gaming got out of hand, and how the clinic helped him to regain control. Help support our independent journalism at theguardian.com/sciencepod