Right, when we decide to giving up gambling than we realize we can't control ourself for left the gambling. But i have one think, we never go to that stage where we want to left it, because if we handle gambling like a game, and play it for fun than definitely we never think to give up the gambling. Gambling have doesn't mean to destroy yourself, it has clear mean fun and entertainment.
A lot of people actually don't play 'just for fun' and take gambling seriously as a source of income, which can be a root problem to their addiction.
Anyhow, the first step into giving up in gambling is to accept the fact that you're not going to be profiting in it for the long run. With that state of mind, you may eventually stop gambling and be focused on other things. Of course, this doesn't always work for everyone.