cp addiction is a very common disease among coders. You can check the symptoms in the following link http://codeforces.com/blog/entry/12968
cp addiction impacts on many software companies. Many coders spend more time on codeforces rather than on their projects, also some employees skip working days just to take part in cf rounds. That is why some companies have considered to block codeforces by adding it to the firewall!
Even Mike was trying to find a cure by adding a [delete account] feature, you can see it here: http://codeforces.com/blog/entry/59406
... However so far curing cp addiction is an open problem.