I was never a Pot head, but I used alcohol escessively for the same purpose. I would spend 2 or 3 hours looking at porn and downloading and saving every picture and video I could find. I would even surf porn with the monitor turned away from the family. It was part of something else. I was diagnosed with Bipolar 2 disorder and put on Divalproex. My cravings are 30% of what they were. I still surf occasionally, cause thats what dude's do, but... It doesnt control me. In the really bad times I could stare at the monitor and get tunnel vision, it almost felt like I was in a tunnel with the air rushing past my ears, oblivious. I am seeing a Psych and getting my meds straightened out. I'm not perfect buit I am feeling human again. Soon, at my PSych's request I intend to see a sex addiction specialist and talk some of it out. I spilled it all to the PSychiatrist and felt better. after 2 weeks on the meds I started to fell great. Get some help, please. It took me years to realize I couldn't do it alone.
Sounds like you need to look into SA and NA. Adiction is adiction no matter what type it is, and most people need help with adiction because they can't help themselves. So I would suggest you look in your phone book or go online and find meetings in your area.