In today's world it's almost impossible not to use the internet at all.  But if you are an internet addict, you can't trust yourself to make decisions on the fly about what is absolutely essential and what is not.

What I did when I quit was to make a list of things that I feel are 100% essential uses of the internet.  I printed it out and taped it to my monitor.  I never open my browser for anything that I can't see written down in black and white on that list.  This is what I call quitting.

This is not a list of things that the internet just makes easier.  If there is ANY WAY to do what you want to do outside the internet, do not put that on your list.  Even if it will take a couple extra hours to go to the bookstore instead of buying the book online, think of the hours you will save by not being on the internet and just go to the bookstore.

Here is what my list looks like:

Banking

Flight reservations

Directory assistance

Maps and directions

Coediting with Google Documents

Public library

Work-related research

(and, now, this website)

Your list may look slightly different.  The most important thing to keep in mind is that your list should include only essential items, and only items that do not invite overuse.

You'll note that email is not on my list.  I manage my email by only checking email when it is downloaded to my computer via POP.  If you don't have POP enabled email, I suggest you get it.  If you have to log onto a browser to check your email, it's a slippery slope.