The popular battle royale shooter game 'Fortnite' is the subject of a class action lawsuit in Canada, where some parents argue the game is as addictive as cocaine for their children.
"To the brain, a drug is a drug and sometimes that drug is a substance and sometimes that drug is a behavior."
Dr. Greenfield told HBO's "Real Sports" the lawsuit's argument has merit.
"Video games activate the same pathways of the brain that all the other addictive, abusable drugs do; it's the same thing, it has the same potency."
The suit, which has yet to be approved by the court, seeks to hold the U.S.-based publisher of Fortnite, Epic Games, accountable for trying to make the game as addictive as possible.
Dr. Greenfield says addicting kids to video games is like shooting fish in a barrel.
"During adolescence they have a wide gap between their ability to exercise self-control and judgement and their ability and desire for pleasure; it's a perfect storm for addiction for that age group."
The lawsuit notes the World Health Organization has recognized what it calls "internet gaming disorder" as a disease.