Tired of seeing his unemployed son spending excessive amounts of time playing online games, Mr Feng hired virtual assassins to kill his kid's virtual persona in the hopes to deter him from gaming so much.
Prof Griffiths said he heard from many parents who were worried about their children's gaming habits but often it was not an addiction.
"I've spent 25 years studying excessive video game playing," he said.
"I've come across very excessive players - playing for 10 to 14 hours a day - but for a lot of these people it causes no detrimental problems if they are not employed, aren't in relationships and don't have children.
"It's not the time you spend doing something, it's the impact it has on your life."
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