When you are addicted to gambling, you will play or gamble regularly and most of the time. Each gamblers reasons may vary from one another like greed, chasing previous losses, fun, entertainment, and the like.
I don't think people who gamble only for fun they will never get addicted to gambling, but the gambler who wants an easy money will get addicted to gambling faster. Because people who gamble for fun they know their budget to spend on these games and they will not be worried even though they lose that money. But whoever gamble for money they can't take it if they lose money so they will again come back soon to recover their lost money and again they will lose more money in gambling.