Some mold stuff I’d found in my digging a couple of years ago:
The most common mold on processed tobacco is Aspergillus Fumigatus. Over 30 other Aspergillus strains have been found in processed tobacco (Papavassiliou, et al, 1971). Some Aspergillus strains produce aflatoxins which can be fatal or produce long term damage when inhaled.
A 1968 study done by scientists at the British American Tobacco Company (Wood, et al) determined that viable mold spores from contaminated tobacco enter the smoke stream in sufficient quantities to “...warrant some consideration of the role which micro-organisms may play with regard to smoke toxicity.”