I see addiction as a form of escapism. People are unhappy with their lives (or just plain lazy and can't be bothered to put effort in) so they turn to drugs, alcohol, computer games, etc, as a crutch to help them escape reality. Or they use the television or their phones or some other form of entertainment to help their minds switch off and distract them.
Not saying that everybody who drinks is an alcoholic and using it as a crutch, nor is everybody who watches television a mindless automaton. But when you get to the point where these things become such an integral part of your life that you feel you can't function properly without them, clearly something has gone wrong.