Becoming addicted to gambling is certainly a fairly serious problem, because with this someone can ignore other things by only prioritizing the gambling that they want, sometimes they don't care about the situation that occurs even though it is a difficult situation they can still force themselves to gamble.
A serious problem indeed, as it's not the gambler alone that will be affected but also those people who sorrunds him especially those who cares, but since addiction mostly being denied by the gambler who already suffering he won't change anything as he thinks thathe's just playing as it is and it's a normal way but those who seen the effects of addiction can verify if the person is still in denial as it's different from how he's doing the action compared to what he's keep stating about his gambling participation.
It's best to take chance if you know or if you relates to someone who already showing the sign of addiction, telling the truth and trying to find alternative activities may help just be careful with how you explain things for the betterment of the person.