Chemicals have long been linked to cancer, but the toxicity of some of the chemicals is so severe that the World Health Organization says it has no place in modern medicine.
Chemicals are the second most common cause of death, behind heart disease, the WHO says.
And although the WHO is concerned about the potential health effects of a few chemicals, it doesn’t recognize any carcinogens, chemicals that can be harmful to the human body, the organization says.
The U.N. says about 5% of the world’s population has some form of cancer.
The WHO is also concerned about other chemicals linked to health problems, like the neurotoxin acetaldehyde, and aflatoxin, the most potent carcinogen in the world.
The International Agency for Research on Cancer (IARC) has warned that these chemicals are highly toxic to animals and humans.
Aflatoxin is the main cause of birth defects, according to the National Institutes of Health (NIH).
Aflatoxins are also known to cause birth defects in rats and mice.
The IARC also warns of other chemicals, like hexavalent chromium and cadmium, that can cause reproductive harm.
The chemical is considered a probable human carcinogen because it has been found in some tissues of rats.
Hexavalent Chromium, found in paint, gasoline, and plastics, can damage DNA and cause cancer.
A report by the U.S. Environmental Protection Agency (EPA) in 2011 found that there were about 100 chemicals that were known to be carcinogenic to humans, but only about 25 of those chemicals had been linked in scientific studies to cancer.
In 2012, the EPA said the IARC should revise its definition of a carcinogen to include more types of chemicals.
A year later, the IACC reaffirmed its position.
But the IARB doesn’t allow its members to vote on the definition.
The issue is not being resolved, but a resolution is being sought by the IHC and the IHO.
But while the IHOs and IACC have not resolved the issue, they do acknowledge that the WHO’s criteria for carcinogens don’t work in this case, as they can’t identify chemicals that have already been shown to be harmful.
The chemicals with the most concern include polychlorinated biphenyls (PCBs), which are used in plastics, pesticides, and fertilizers, and are known to pollute the environment.
A recent study found PCBs in urine samples of people living in countries where they were banned.
PCBs have been linked with cancer in a variety of animal studies, and the WHO estimates that they are the most toxic chemicals in the human diet.
The toxicological impact of PCBs is so great that it can have long-term effects on the reproductive system.
The health impact of the PCBs has been widely studied.
A study by researchers at the University of Colorado at Boulder showed that children exposed to PCBs had higher rates of autism, schizophrenia, and depression than children not exposed to the chemicals.
The study was published in the journal Environmental Health Perspectives.
The researchers found that exposure to PCB-containing products increased the risk of a child developing autism and schizophrenia.
There is no known link between PCBs and birth defects or cancer, according the IHF.
Some studies have linked prenatal exposure to the pesticides to developmental problems later in life.
A few studies have found that people who are exposed to prenatal PCBs may have a greater risk of obesity.
The American Cancer Society estimates that the risk is about one in 5,000 for women and one in 20,000 in men.
Other studies have suggested that exposure during pregnancy is linked to developmental abnormalities in children.
The research is being done in a large group of women, and it is unknown if there is a link to cancer in the babies.
But it’s not the first time the WHO has raised concerns about PCBs.
In 2006, the World Cancer Research Fund (WCRF) issued a warning that PCBs were linked to birth defects and developmental problems in some infants, and that it should be prohibited.
But WCRF said that the IAC should have done a more thorough review.
The WCRFs board members also have not voted on whether or not to ban the chemicals, but have decided to focus their efforts on other substances that may be harmful, like pesticides and PCBs, the WCRFS said in a statement.
The board members voted to adopt a resolution in September to consider the WHO definition for “carcinogenic” chemicals.
Some scientists have also raised concerns that the use of chemicals as food preservatives may increase the risk for cancers in the future.
The World Health Organisation’s latest guidance states that “the use of preservatives, other additives, preservatives for cosmetic purposes or for purposes of food storage and preparation” should be banned.
But some scientists say that preservatives can be used as food additives and can even cause cancer in humans.
It also says that it is possible that some chemicals can be added to foods to help