I highly agree those who are addicted to gambling should avoid things that have a connection to gambling and make themselves divert their attention and find hobbies that will take their mind out of gambling activity. It is also recommended to undergo medical treatment so a visit to a doctor is also needed. Though it would be best for a gambling addict to slowly lessen the hours they spend gambling until they can manage to stop their gambling activity. And for a gambling addict, medical treatment and guidance will be the best thing to follow.
It would seem to me that slowly decreasing the amount of time a gambling addict spends gambling is not very realistic, because if a person could do something like that until eventually they stop gambling altogether then it could be argued that they were never addicted to gambling as they had enough self-control to stop themselves whenever they wanted, so I really think that those that have problems controlling their impulses when they gamble should stop immediately and they should avoid any activity that is remotely similar to it.