Tainted marijuana’s possible health effects include allergic reactions, experts say Though reports are rare, one type of mold has caused hospitalizations and deaths. By Stephanie Zimmermann and ...

The most typical types of mold that could grow on cannabis (the flower or the leaves) are Botrytis (aka "bud rot"), Cladosporium, Mucor, Penicillium (yes, where penicillin comes from), and Rhizopus.