In an interview with The Times, Smith condemned violent games and said that more needs to be done to ensure age ratings are enforced.
"We are driving children to lose their childhood, and some video games are incredibly violent, like Grand Theft Auto," he said. "They are meant to be 18 [rated] but nobody cares what it says on the label."
Last year, games industry body PEGI introduced a new classification system that includes placing larger age rating symbols on boxes. The government began enforcing this system during the Christmas period.
According to a recent survey by MyVoucherCodes, 33% of parents in the UK allow their children to play adult games.