On the subject of moldy bud:
-Mexican bricked weed is unlikely to have dangerous levels of mold spores in it, and even less likely to have botyris rot on the buds themselves, due to the arid climate in which it is grown and harvested.
-On the difference between bud and leaf, leaf left on the bud during the trimming process may be considered part of the bud itself. Both leaf and bud are subject to rot when improperly dried, or packaged before moisture content is still elevated.
-Look out for bud grown in damper climates, especially if it is mass-produced, or for bud that was commerically grown and packaged early. Beasters are a good example of this, and often arrive still somewhat damp.
-Mold spores are everywhere, in the air around us, at all times. Minimize your exposure by choosing correctly-dried bud, and inspecting it for a grey-tan, excessively crumbly, or in extreme cases, fuzzy appearance, and discard those buds.
-If your immune system is not functioning properly, explore other methods of ingestion such as edibles, where any pathogens go first through your very acid stomach environment- not into your more vulnerable lungs.
-Note that MMJ cards are regularly given to AIDS patients. It is an accepted safe treatment for the side-effects of the drug cocktail.