I've always considered gambling addiction an affliction that is much worse than substance addiction. Whereas you have a limit to how much you can slam into your body and whereas your finances are depleted for the substances, there is only so much damage that you can do in one moment with substance addiction unless you're dying from it.
Addiction is still an addiction, no matter what kind it is. Once you are really into a certain activities, then you will really push yourself to do that no matter what happens. For me, IMO, substance addiction is much worse, it can cost lives once people are not knowledgeable about it, while in gambling addiction, you can overcome it once you control yourself and you have someone to guide you in order to limit yourself from doing it. Gambling addiction is not that easy to avoid, that's why you should do it little by little.
Problem gamblers, though... I bet their stakes go up in correlation with their external wealth, and there's no stopping it. It's pretty difficult to spend 30K on heroin in one day, but to spend 30K on a couple bets in a casino in a few minutes? You basically get rid of the buffer zone for any regret. Everything can happen instantly, and if you find yourself stealing from others to gamble... you get situations like this.
If someone will do anything just to steal money and spend it in gambling then he should be accountable on the consequences that may come to him. That's very unfair, you are using money that isn't yours. It is true that it is easy to spend money in gambling because the circulation of money there is extremely fast. You just place your bet and BOOM! the results are there. I encourage you not to do gambling if you don't have your own budget to spend.