As humans, there seems to be a lot of different things that we are addicted too.
Our society is set up for us to gain addiction at an early age, with instant gratification. Things that are designed to keep us entertained, will keep us distracted all day.
Things that distract us tend to get us addicted.
Some things could be as harmless as running, but what about the guy that gets addicted and keeps running? Running so much that it puts unnecessary strain on his heart and it gives out. Addiction is bad no matter where it comes from and too much of anything is always a bad thing.