Very often , such people use illegal drugs , but this does not have to be the case : many can also be addicted to smoking , gambling , food , exercise , work , video games , pornography or relationships . This is called Codependency . They are frequently connected with substance abuse , but people with addictive personalities are also highly at risk of becoming addicted to gambling , food , pornography , exercise , work , and even relationships ( codependency ) ( `` Addiction\/Addictive Personality '' ) .