Because they not only lose them they will also take their family into their problem in the most cases, I think the best to speak about it with a relative and find professional help.
That would be the best solution. I also recommend to speak to your close friends who are not gambling addicts of course. Listen to those who you trust and maybe they will convince you to stay away from gambling if you can't control yourself when making bets.
That Urge in making decision towards gambling you yourself can handle that alone, it is all in the mind change your mind set towards gambling but you cannot change it that fast you have to do it one at the time!