Buyer's remorse, a mild form of cognitive dissonance, is the internal conflict that arises from an inconsistency (disharmony) between competing beliefs, or between beliefs and behavior.
Step-by-step explanation:
In the psychology field, the occurrence when a person retains two or more contradictory views, ideas, or values, or takes part in a behavior that runs counter to one of these three, and thereby encounters psychological stress is understood as "cognitive dissonance".
For instance, when humans smoke (behavior) and realize that smoking causes cancer (cognition), thus they are considered in a cognitive dissonance situation. It is used as a concentration on more positive beliefs which outweigh dissonant ideology or behaviour.