The World Health Organization officially classifies gaming addiction as a real disease.
Disorders due to addictive behaviours are recognizable and clinically significant syndromes associated with distress or interference with personal functions that develop as a result of repetitive rewarding behaviours other than the use of dependence-producing substances. Disorders due to addictive behaviors include gambling disorder and gaming disorder, which may involve both online and offline behaviour.
The WHO considers both online and offline gaming as addictions. It is likely this finding will find its way into psychiatric textbooks in the next publich cycle.