Addiction?

Recently someone said again how the internet and computers can be addicting. So I asked a friend of mine who is a doctor (MD) and who specializes in Addiction Consulting. Here's what he wrote to me...

"For something to be considered an addiction it needs to:

1. Take control of the person's life
2. Result in harm to that person or others and be continued despite the harm that it is doing
3. Be carried out at inappropriate times and to the exclusion of other important activities
4. Be associated with craving (withdrawal) when in a state of early abstinence
5. Result in excitation of the reward cascade (dopamine and endorphin) in the mesolimbic system of the brain

With these points in mind, I leave it to you to decide if this or any other activity contitutes a true addiction, or just something that takes up a lot of a person's time and energy. Just because a person devotes time and energy to a pursuit doesn't mean that the pursuit is addictive behavior."

So who's an addict? You tell me.