When it becomes difficult for someone is addicted to gambling to quit. I think its not just about quitting gambling he has to do, if he as any other thing he is addicted to he should first quit on those ones because quitting those ones might make him lose interest automatically in gambling.
Curing an addict is not just by saying stop but special supervision needs to be carried out and as much as possible given other activities that are much more productive so that they can avoid the illusion of gambling. It may seem excessive when someone says gambling addiction, but there are many people who are trapped and find it difficult to stop and there are several factors that may encourage someone to get involved excessively with no control.
Another way is to limit money and do not give ATM cards that have a balance so that they cannot make deposits. This is a practical way that parents can apply and may not work for addicts who control their own money. Things like this need to be closely monitored because addiction is not something that is easy to cure.