well i do know people that are so used to gamble that it is really part of their lives. they have to gamble everyday and they able to find private gambling den to play even it is illegal.
That will still let them think about gambling and the fun of gambling is. Much better if the environment of gambling will be removed and put their attentions to a better place without any sense of gambling. Like hanging out with your friends and spending quality time with them in malls or parks that you can enjoy each companies.
As suggested, If a user gets an environment which doesn't give even a small thinking about gambling can get him out of gambling to a certain time. Surely he will return back to gambling after days. I believe if one has entered no way to go out of gambling.