I think my opinion on what you say is that sometime You control yourself to stop for long periods of gambling You just make a mistake when you see a gambler so you're returning to a bad habit we have the same situation I want to avoid it but i cant do it i cant really stop it.but now i control my self for playing gambling games.
When someone return to gamble that doesnt mean he return to the old habit. What I called as returning to old habit is the habit when you keep spending money for no reason at all. If you want to gamble and have fun then you can do it with small amount but I dont think that most people will do it as they think it is fun to win alot of money
losing money on gambling is not fun and when somebody return to gamble, he will think how many bitcoins that he already lose before and he will become greedy and always bet until he's getting back all his losses back. Return to the old habit is really possible.
Depending on the person because for me I have decided to lose everything that I lose back then. So everytime I come back to gamble, I wont be chasing what I have lose. People will keep trying to get back what they lose and get back to their old habit unless they decided to quit and call it the day. Come back tomorrow just for having fun