Theory is an Explanation , an attempt to account for the reason why something happens. Most theories cover different aspects of the same phenomenon and are regarded as complimentary rather than contradictory.
The biological theories has two explanation which is : The genetic theories and the metabolic imbalance.
Psychological theories
Sociological Theories
Sociological theories make use of broader, structural, cultural, or institutional factors and variables •
Social disorganization • Anomie • Social control and self-control • Social learning and subculture •
Selective interaction or socialization • Conflict theory
Reinforcement theories suggest individuals continue drug use because they have a past history of
being rewarded for doing them • Personality theories suggest individuals have a type of personality
that compels them to use and abuse drugs