There are various symptoms seen in an addicted gambler. Especially if a gambler gambles a lot, then he cannot take a break from gambling. When he lost his money, he arranges money in a short time. Some may borrow money from others,  some may selling some valuable asset of his own or family, and gambling with that money. The characteristic that I have seen in addicted gamblers is that they are most of the time unconscious, and their attention is not increased in the work they do. Nowadays, it is difficult to determine if a gambler is addicted. Because they do not reveal it to others. But if any such symptom is found in a gambler, then they are definitely an addicted gambler.