Check out this thread http://boards.cannabis.com/plant-pro...like-mold.html
and the folllowing links.

Plant Problems

http://boards.cannabis.com/plant-pro...l-goodies.html.

Hope that helps:What you should know about mold issues on marijuana // Current TV (here is part of the last one)

It was recently reveled that police investigating Michael Jackson’s death had mistaken moldy marijuana for “tar heroin” following the pop stars death. While the moldy weed played no part in the investigation or Jackson’s death, it does bring up an often overlooked problem that faces almost every marijuana user, grower or distributor: Mold.

Anyone who has smoked marijuana more than a couple times has most likely inhaled mold spores from marijuana. That may sound alarming, however its important to remember that you are likely to inhale the same or similar mold spores while taking a walk in the park. The most common type of mold, Aspergillus, occurs naturally in almost everything in nature.

Most mold spores will have little effect on people with normal immune systems. If the mold is bad enough to cause problems, effects are usually respiratory breathing problems and flu like symptoms such as coughing, diarrhea and vomiting but can be more severe in people with other health conditions and/or a poor immune systems.
Causes of mold on marijuana
Mold issues in

A few more things to read:

Cannabis FAQs / FAQ , Recipes, Medical Marijuana

:rastar