It's easy to spot if a person is already an addicted gambler. Based on what I've noticed or my *study* people who are suffering from gambling addiction has this;
1. Uncontrollable thirst for Gambling - People that are addicted to Gambling to tend to think and look for any kind of Gambling to satisfy their self. An addict's day isn't complete without them playing any kind of Gambling with or w/o money.
2. Sudden Change of Attitude - Most of the addict gamblers tend to get mad easily, they began to be moody. *Knowing that he's already into gambling*
3. Mannerism (Coin Flipping, Coin shuffling and etc.) - Most of the Gambler tend to adapt to a mannerism in which they are doing it outside the casino. They don't notice it and It's a normal thing to them.
4. To the point that they sold everything just to gamble - Well, this is not new to us. An addicted gambler could do such things, like selling their house, cars, any valuable things even wife and kids, just to have money for gambling. This I think is the worst point of an addicted gambler.
Well I know there are still a lot of signs to know if a person is already addicted to gambling. Though, this is just what I've noticed so far.