Patients with Parkinson's disease are about five times more likely to become problem or pathological gamblers than others, concludes a new Canadian study that offers some of the most dramatic evidence to date of the unusual link. Almost one in 10 of the Parkinson's patients studied by psychiatrists in Calgary was found to have a gambling addiction of some sort, with the likely culprit being a type of drug prescribed to most people suffering from the condition, the researchers said.