Growing up in Auckland's Papakura, Nelson Wahanui watched his parents' gambling problem spiral out of control when pokie machines were introduced.
He doesn't know exactly how much they lost gambling several nights a week, but said the introduction of the machines allowed them to spend more and faster than they ever had before.
More needs to be done to warn people about the detrimental effects of problem gambling, he said.
"What I felt in terms of my parents is they were very vulnerable to pokies and that form of gambling," he told a Parliamentary Select Committee in Auckland today.
"It's similar to fishing stories, you only hear about the good times."