This is further complicated by the fact that problem gambling is rarely found in isolation. Problem gamblers often also experience other problems, such as alcohol or drug addiction, alongside. This is known as co-morbidity. Genetic studies have found inheritable risk factors which support the notion that people may be genetically predisposed to develop impulsivity or addictive disorders. It is likely that developing a gambling problem is due to the interaction of various biological, psychological and social factors.