Addiction may be defined as known to be harmful compulsive, repeated action that the long run. You may be addicted to a substance or activity if (check all that apply) a. you are constantly preoccupied with it. b. you made repeated unsuccessful attempts to stop it. c. you feel irritable or depressed when not doing it you lie to others about the extent of your dependence d. you use it excessively sometimes to accomplish a productive task