One of the things that can be done is maybe I hope there is one of them who always reminds them about the dangers of addiction or even better to remind each other so that they can keep their awareness so as not to overdo it. On the other hand, the fact that losing control and forgetting some of the boundaries they have made before are still very likely to happen as I said above when they are really tempted by something they see. So in my opinion what is better is if they can better find other activities on weekends such as going to one of the entertainment venues or the gym and get used to it slowly, because after all in my opinion gambling is an activity that inevitably has to use money and the risk of losing is always lurking.
We may still often lose self-control when playing gambling so that we cannot control the use of money, especially when gambling, we can forget ourselves because we get pleasure from gambling. However, we must be able to use gambling as entertainment that uses money. But as long as we can control the use of money, we will not overdo it in gambling and can allocate a certain amount of funds for gambling every week or month. And we can also enjoy or get pleasure from other things so we won't just focus on gambling. And it is true that as friends, we can remind each other not to gamble excessively so that no one among us will be addicted to gambling.