I’ve noticed that if I say “I won’t do this anymore at all”, it doesn’t work. But if I say “I’ll only spend this much this month on sex workers, gambling, etc.” I’m able to mellow down. I’ve also noticed some people suggest that moderation doesn’t work and you should try to be as cold turkey as possible.
If you can keep it at what you consider an acceptable level then it’s fine.
In my case I tend to go from keeping an acceptable level for a few weeks, then one becomes two that becomes three and then I’m back at the original unacceptable level.