Dont smoke it if you are concerned about health. If you suspect mold just toss it out and wash your hands.
Smokin a small bowl to see how it affects you is silly. Mold wont hit you immediately like that. Ive read up on some weed molds and there are many types. Some wont harm you, some will make you sick, some will make you sick much later, some will kill you. Some it takes a lot for some it takes little. The risk is not just in inhaling it from your pipe but all contact you are having wih it.
If youre growing in that closet you dries it out in youre askin for mold to infest your plants.
Mold is not to be taken lightly at all.
Google the health risks and decide for yourself.

peace