well, I'd say it gets really serious when you start at your workplace
Here goes the same as for other internet addictions as well. A 30day trial with a challenging but not too extreme limit. Something like no porn after 8pm for 21 days. Of course you can say none at all but if you are really addicted you will break it at one point. And cheating means back to the start otherwise the whole trial-concept doesn't work (at least not for me).
Regards
Volkmar