That's a good question. Some research does suggest that internet addiction is real and occurs particularly among adolescents. Unfortunately, if this is a genuine addiction, it is tricky to treat - computers are now part of our daily lives. You can't avoid them as readily as you can alcohol, drugs or gambling. If your time spent online is interfering with other aspects of your life, and if most - if not all - of your leisure time is devoted to computer usage, you certainly could have a problem. Recognizing it is the first step toward overcoming it.
Here's how I set limits on personal technology use.