I've been diagnosed since I was 6 and my OCD is pretty severe.

The effects of weed (and I guess any other herb/drug/chemical etc.) on OCD, like the symptoms themselves, vary from person-to-person. For me, it helped me tremendously, more than any of the dozens of medication I've been on in my life. It also helped my depression and Tourettes (I get shaky sometimes, nothing huge). :smokin:

If your friend wants to try it, it's very important that his first time is a comfortable one, around people that he knows and trusts. Getting together with a small group of friends at somebody's house is usually a good first-time experience.