When gambling, setting limits before the session is important (atleast for me). If I deposit 10$ for example, I quit if I lose, and I withdraw if I hit 20$. That way is easy for me to keep in control, even though I very rarely gamble.
If anyone here is struggling with gambling addiction, I suggest you try to get your mind out of it by replacing the habit of gambling with something else. According to studies it takes 22 days to quit a habit