How to recongnize addiction to gambling? How to recognize when your bad plays are not due to tilt but addiction to gambling? What can be done?
The gambler's anonymous site has a list of 20 questions as a starter.
Some things to note about addictions in general: It is not about the quantity but more about the emotions and behaviour.
The CAGE questions can also be applied (in part):
As for what can be done - I believe Gambler's Anonymous follows the same 12 step program as alcoholics, drug addicts etc.
Although there are parallels between addictions, not all can be dealt with in the same way. For example, abstinence forms a key part in many recovery programs but for some addictions (over-eating, sex addiction etc), this isn't practical for obvious reasons.