Alcoholics never think they have too much to drink. Workaholic know they work too much but justify but telling themselves it's a necessity. I read somewhere we are all addicts. According to Wikipedia, addiction is a form of dependency on things, activities and even feelings.
We are all aware of addiction to substance; drugs, booze, tobacco, food. Some of us are addicted to watching TV. There are also other forms of activities we are addicted to. Those who follow Tiger Woods's divorce reads that he's said to be addicted to sex. Even too much of a good thing is bad; there are people who are addicted to exercise. And of course, most shopaholics would deny they consume too much.
There's the less obvious addiction to feeling. The feeling of high from gambling. The ecstasy of love. It may sound crazy but some of us are addicted to negative feelings that make us feel lousy; depression and guilt.
Yoga teaches us to balance. It is more than balancing on one leg. Yoga teaches us to have a balance approach to life and balance is what addicts need.