"That distinction has become meaningless. Anyone who gets caught with more than the "intent to distribute" threshold (which apparently isn't a lot) is simply presumed to be a dealer."

It's more than just quantity:

"Anyway, several things can determine intent, including quantity. Other factors might include quality, packaging, what type of area the person was in and the time of day."

http://forums.officer.com/forums/showthread.php?77095-Intent...

If you are by yourself or with a few friends smoking a joint, the cops won't really bother you.