Originally Posted by jillio

Chances are better that it doesn't actually cause the paranoia or panic, but exacerbates the panic or paranoia that are already present in the individual at the time they smoked. It does decrease inhibition, which would allow those things to become more evident.

Same thing with an angry person who consumes alcohol. They become less able to control their anger due to the disinhibitiing effects of the alcohol. But alcohiol, in general, decreases inhibition to a much greater degree than does marijuana.