"The results highlight some of the links between problem gambling and drug addiction, and have implications for both psychological and drug treatment for problem gamblers, " Clark said.

The study looked at 30 compulsive gamblers who sought treatment at England's National Problem Gambling Clinic. It was published in the journal Psychological Medicine.

But gambling can be an illness, and some people on the list still try to sneak in by changing their name or swapping a few Numbers in their birth date.