It can happen. I've seen people go back to becoming alcohol even after a year of sober. It's not complete if we are not able to avoid it regularly for a lot of years. There will always be the urge to gamble again especially nowadays that advertisements about gambling are coming left and right in different social media and even in local television.
It's possible that a gambler who got through gambling addiction will go back into playing because it still calls him.
... totally agree – it happens a lot. Even after years away, it can take just the smallest thing to pull someone back — the habit never fully leaves your mind. Beating gambling addiction means showing up every single day and choosing not to play, again and again. And it’s getting harder these days – gambling ads are literally everywhere, constantly poking at you to play again. That’s why relapse is always a risk, and the key is working on your self-control and keeping the right environment so you don’t fall back into old habits.