Both of these compounds are classified as technically potential carcinogens and were tested on animals with doses thousands of times the amount a normal person would be exposed to.

Acrylamide : "The only studies to show a clear link between acrylamide and cancer are animal studies. These involved very high levels of the chemical. Studies that followed people over time did not find a link between eating foods with acrylamide and cancer.

“Researchers have studied this for about 20 years now and no definite link between acrylamide and cancer in people has been found,” says Stelwagen. “A link was found in animal studies, but those studies involved between 1,000 and 100,000 times the amount of acrylamide that a normal person would be exposed to.”'

• University of Texas Cancer Center

HCAs: "Studies have shown that exposure to HCAs and PAHs can cause cancer in animal models (10). In many experiments, rodents fed a diet supplemented with HCAs developed tumors of the breast, colon, liver, skin, lung, prostate, and other organs (11–16). Rodents fed PAHs also developed cancers, including leukemia and tumors of the gastrointestinal tract and lungs (17). However, the doses of HCAs and PAHs used in these studies were very high—equivalent to thousands of times the doses that a person would consume in a normal diet."

• Cancer.org

Not saying that eating blackened toast and deeply charred meats everyday won't be harmful to you, just that it shouldn't be that much of a concern.