Hi. You could start with Aflatoxins (type of mycotoxins) from the fungal mould Aspergillus. Article Mechanisms of Aflatoxin Carcinogenesis

Aflatoxin B1 is quite a potent carcinogen and would be a good one to look into as the mechanism is well established.

you can study about aflatoxin from cereal ,its very risk on human health.

good luck

As everyone mentioned earlier, fungus produces toxins moreover the spores they produce could block the air passage in nostrils. The effects in blockage of air will never be abrupt but severe once it gets along. It could be fatal too. The handling of fungus must be good enough to prevent its outbreak. So most food industries expose the raw material/ intermediate product to such high temperatures to suppress the growth. If the higher temperature affects the quality of food product, it is better not to use fungus and try some other bacteria that serves the purpose as most bacteria are mesophile.