I like to smoke pot, can I catch aspergillus?

Not likely. The most common thing that occurs in pot smokers where the pot is contaminated with aspergillus is asthma attacks in people who develop an allergy to the aspergillus fungus. Aspergillosis, which is a form of fungal pneumonia, is rare, but can occur if people who are immunocompromised (aids, cancer treatment, organ transplants and other causes) are exposed to aspergillus.