Addiction is manifested in any behavior that a person craves, finds temporary relief or pleasure in but suffers negative consequences as a result of, and yet has difficulty giving up. In brief: craving, relief, pleasure, suffering, impaired control. Note that this definition is not restricted to drugs but could encompass almost any human behavior, from sex to eating to shopping to gambling to extreme sports to TV to compulsive internet use: the list is endless.
"Addiction is neither a choice nor a disease, but originates in a human being’s desperate attempt to solve a problem: the problem of emotional pain, of overwhelming stress, of lost connection, of loss of control, of a deep discomfort with the self." -- Dr. Gabor Maté
The Joy is in the Journey