Aflatoxins form one of the major groups of mycotoxins. Aflatoxin G1 is a poisonous carcinogen and mutagen produced by the molds Aspergillus flavus and Aspergillus parasiticus which grow in soil, decaying vegetation, hay, and grains. Aflatoxins can colonize and contaminate cannabis and hemp plants before harvest or be found in improperly stored final products. Children are particularly affected by aflatoxin exposure, which is associated with stunted growth, delayed development, liver damage, and liver cancer.n colonize and contaminate cannabis and hemp plants before harvest or be found in improperly stored final products. Children are particularly affected by aflatoxin exposure, which is associated with stunted growth, delayed development, liver damage, and liver cancer.