When any fat is heated to frying temperatures, toxic volatile chemicals that can cause genetic mutations are released into the air.

It isn't safe to go to the parks. Toxic chemicals ruin the air and water. There is vandalism, even crime, and conscientious park personnel are demoralized.

Tobacco smoke contains chemicals that weaken the body's immune system, making it more susceptible to disease and handicapping its ability to destroy cancer cells.

Certain foods, such as meat, appear to harbour toxic bacteria - known as endotoxins - that can trigger inflammation in your arteries, even when food is fully cooked.

About a quarter of lung cancer cases occur in people who have never smoked. One cause may be another potential carcinogen: fumes from frying.

I suspect any worries about genetic engineering may be unnecessary. Genetic mutations have always happened naturally, anyway.