Is there truly something known as an addictive personality?

Yes: An addictive personality refers to a particular set of personality traits that make an individual predisposed to addictions. People who are substance dependent are characterized by: a physical or psychological dependency that negatively impacts the quality of life.

Not really: There are psychiatric conditions, such as bipolar disorder, where substance use disorders are more common, there is really no one particular personality type associated with having addictions. That being said, a lot of people who develop addictions will develop them to a lot of things - alcohol, drugs, compulsive shopping, dangerous behaviors etc. People who are impulsive&take risks more likely.