No addiction is healthy. Some addictions may be less harmful than others, but that doesn't make them healthy. An addiction is any uncontrolled impulse that takes over your life.

For example, yes we all need food to survive, but those who are addicted to food have an uncontrolled impulse to over eat that controls their life.

Those addicted to the internet have an uncontrolled impulse to spend hours online. This impulse controls their life.

The thing is we can gain control of these impulses and gain control of our lives, instead of having our lives or addiction control and take over us.