Indeed, addiction is very severe, it really affects the life of each user so much, and it will affect others too, gambling is not really bad, it is depends on the gambler on how we interact and how we dealt with every winning and losing of our game, we need to put all in moderation and make all things be in our control, most espcially ourselves in which we need to take care , our emotions can affect our gameplay.
It always depends on the gambler if how they treat the gambling casinos there are some people are addicted to gambling but why they still stand like a normal player. If you can control your addiction it won't become worst.
People who treat gambling as a source of income well that's different it is not a part of addiction because they can control their self to bet large or of they win they will stop to take the profit but for those people treat gambling as a game(Just like a child who addicted on the game) well, those people are addicted and day by day they have become worst that could bet a large amount of money in a single bet/game. If you are in this case it can lead to losing so much money that will end up selling things and property. That's the worst thing for an addicted gambler that treating it as a game.