There are things you really can't help yourself with unless you stop coming eye to eye in contact with that thing, I have my addictions too and it's not about gambling or money, it is food and taking too much do hurt me in the end but since I can't control myself I need to rescue myself, the only thing that worked for me is avoiding the food, I can't control myself to eat a little part and do the same another day.
I never knew people also get addicted to food too. If I'm not mistaken, this is the first time I've come across such a kind of addiction. I eat and I get fed up, and when I still see snacks or things that I like, I still buy them to keep my mouth busy. Will that also be considered a food addiction?
I think this is what smokers are facing too, once they decide to go closer to someone who smokes they will end up going back to been a smoker, with addiction I believe there is no such thing as been in control while still participating in that thing, you either quit it or you surrender to it.
In this aspect of addiction, I will say everything is just based on discipline, and I will link this to drinking habits and addiction too. I know of someone who takes alcohol a lot and loses control of how much he consumes most of the time, which was really turning him to something else, but due to the disgrace and advice from family, he decided not to get involved in anything relating to alcohol ever again, but he still has a group of friends who are in that, like they sit out together and those people take alcohol, but he doesn't do that anymore instead he goes for other soft drinks around, and at the end of the day everyone goes home happy.
Inaspect of smoking, people can also still stop smoking and be around those who smoke, and they won't influence them unless it's someone who is determined enough to call it a stop in his smoking habit. Anything one wants to stop, they will stop it; it's just determination and self-training.
To stop been a gambling addict you have to stop gambling, I quit understand what OP is saying, to gamble responsible belongs to those that are half way to becoming as addicted gambler as they can still get their heads clear and do the right things, but for those that are already too addicted to gambling it's going to be hard for them to become a responsible gambler, they as better off staying away from gambling.
Stopping gambling entirely is the best option that many people have given to addicts out there. Since the person can't control himself, it's best they just stop doing that thing, but whereas the person can learn some self-control and add a little discipline to himself, I can't advise them to stop. Although people have different points of view, I'm just going to give out my own piece of advice based on how I understand people and who is in question at that very moment.