Winning in gambling will make your mood happy just as we get some rewards and we feel happy. These feelings are so great and we feel so energic and positive.
However, once we start to lose in gambling, we slowly move towards the sadness phase. If the loss continues and we keep on losing the money, eventually it can lead to depression.
Yes, I understand that depression is a very severe stage and it won't come at once if you are a new gambler but if you are not a responsible gambler, it is very easy for the gambler to lose his emotions and become depressed in life. Focus on other entertainment other than gambling for some time can be helpful in relaxing our mind and regrouping again to come back strongly in gambling with a strong emotion.
That infographic is the perfect representation of how gambling will trap people who are inexperienced and unaware of the tricks that betting can play on your brain. At the outset a casino is trying to make you super happy, it's in their interest that you win a bunch of times, even though they are slowly clawing away at your wallet. They'll even give you free money as a welcome bonus, so even when you're losing - "it's not your money" that was being lost. They hope that you spike a few high wins, which is built into every game, because the mind has this wonderful trick of flooding your brain with happy chemicals when you win, which will cause a very pleasurable memory association to betting, while disregarding all the slow losses as insignificant.