Unfortunately chlorinated hydrocarbons tend to be more toxic and persist in the environment. Industry leaders did not consider the increased risks of environmental harm when making the switch to chlorinated solvents. Now corporations are aware that environmental consequences need to be considered. The first bladder cancers associated with these dyes were reported in 1895. These substances contact humans in various exposure routes, each with unique health consequences.
All chemicals are toxic under some exposure conditions.
Toxicologists try to determine those conditions so that exposure can be limited to minimize toxicity. The pathway for aflatoxin starts when fungi growing on a human food produce aflatoxin which is then consumed. A chemical can have multiple exposure routes. Dose Dose - the amount of a chemical entering the body each day divided by body weight. For medicines doses are calculated quite easily.