I'm wondering why you are relating the obsessive thoughts to marijuana use. Are the mornings worse when you smoke the night before or are you smoking first thing that morning? I've just begun my research into medical marijuana so I'm afraid I have no answers in that aspect. I'm interested to hear more about your case though, I've not seen much about OCD and marijuana, if any at all.

From the little I've read, I suggest you make sure you're smoking a strain that isn't going to aggravate the symptom. I'd imagine sativa vs. indica is pretty important difference in this scenario.

If you feel in danger of doing harm; not just going batty, see a psychiatrist.

If you can't find your own way, maybe see a psychologist. I'd recommend one that specifically does Cognitive Behavioral Therapy. It's a practical way to deal with irrational thinking rather than a lay on the couch...tell me about your childhood approach.

Personally, the most effective thing I've found to combat obsessive thoughts is meditation. It doesn't need to be an elaborate technique, just find one that helps you clear your mind...stop all thoughts for a time. Practice it. Eventually you'll be able to do it instantly. Every time you notice yourself following an unwanted thought...Stop. Clear your mind. Replace the thought. Consciously direct your thoughts in a more productive/positive direction.

Pay attention to these thoughts. Feed them and let them grow. Leave no room for the weeds. Keep feeding the positive thoughts even when there are no symptoms.

Eventually, your mind will be retrained to an extent to abandon those unwanted thoughts immediately. Keep practicing, all gardens take time to grow and a few weeds will always find a way in. Just get to them when they're small.

If you're truly OCD, you'll have a whole new set to practice on in no time! Also keep in mind, obsessive thoughts don't necessarily mean you have a disorder. You may just be needing to face some fears or unresolved anger. You might just need to let some stuff go which no one else can do for you.

Do what you need to do. As long as the thoughts have the power, you are the slave. You're pwnd by the subject of these thoughts right now.