What in the world would make someone drink alcohol until they lose everything they've worked for? Or ingest chemicals until they can't even control their body functions?
An addict is someone who can't deal with life as it is, and is looking for something to mask their pain. They become so obsessed with their "remedy" that they deny the damage that it's doing to them.
We have become a society of weaklings, always looking for something to give us instant gratification or a quick fix. Until we start learning to face our responsibilities and the unpleasant aspects of life, we will continue to seek solace in our addictions.