ChillinoutBB, do you have any history with repetitive thoughts and/or OCD? I'm wondering if the connection with cannabis might simply be coincidental, myself.

I've read a good many anecdotal reports here about OCD relief from cannabis and can't find much in my medical databases that causatively connect the two, but if there is a connection, I'm betting it's through THC, which seems to be the compound that gives sensitive people the most trouble with their thought patterns and perception distortions.

The fact that there's not much published information linking cannabis and OCD doesn't mean it couldn't necessarily cause such repetitive thought patterns in some people. We simply don't know how it affects everyone and can't conclude that because one person doesn't report such repetitive thoughts another person might not have them. It's a medicine that has uniquely different effects on different brain chemistries.

Improvement in Refractory Obsessive Compulsive Disorder With Dronabinol -- SCHINDLER et al. 165 (4): 536 -- Am J Psychiatry
This was an interesting article about the improvement in refractory OCD (meaning repeat, or bounce-back OCD, after first-line treatment with medicines) in response to dronabinol. Dronabinol is the generic drug name for Marinol, the FDA-approved synthetic medicine that contains synthetic THC and is indicated for anti-nausea treatment of chemo cancer and AIDs symptoms, appetite stimulation, etc.