The term means getting psychologically addicted to certain things or practices. Sometimes some people are highly obsessed with practices like gambling, food, sex, pornography, computer, work, shopping, spending, etc.
Therefore as absurd as this may sound, these people do suffer from gambling addiction, food addiction, sex addiction, porn addiction, computer addiction, work addiction, shopping addiction, and spending addiction respectively.
People addicted to food consumption are highly preoccupied with overeating and overeating is food addiction. These people are sometimes mockingly dubbed as “food alcoholics.” Narcissism is also a form of addiction.