Like the inverse of taking drugs ... You feel better when you are on them and then think "Oh heck I'm fine I don't need them anymore. You stop taking them and start feeling poorly physically, but more so mentally.
Same thing with drinking or taking "illegal" drugs (any addiction really). One stops for awhile and starts to feel better and thinks just one or just on special occasions or or or ... YMMV
rinse recycle repeat... till one decides No mas.
Personally, its been about 10 years since I've done coke or weed. I STILL think at times that I'd like to do it again - just a little or whatever... Just catch a buzz and chill for a lil while.
Then I breath deep and keep moving on. Distract myself and think about my kids, family, friends ...