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Chemophobia (or chemphobia) is an irrational aversion to or prejudice against chemicals or chemistry. The phenomenon has been ascribed both to a well-founded concern over the potential adverse effects of synthetic chemicals, and to an irrational fear of these substances because of misconceptions about their potential for harm.

Definition and usage
There are differing opinions on the proper usage of the word Chemophobia.

The International Union of Pure and Applied Chemistry defines chemophobia as an "irrational fear of chemicals". According to the American Council on Science and Health, chemophobia is a fear of synthetic substances arising from "scare stories" and exaggerated claims about their dangers prevalent in the media.

Despite containing the suffix -phobia, the majority of written work focusing on the treatment of Chemophobia describes it as a non-clinical aversion or prejudice, and not as a phobia in the standard medical definition. While the treatment of phobias is generally focused on therapy, chemical education  and public outreach  seem to be effective ways of treating Chemophobia.

Michelle Francl has written: "We are a chemophobic culture. Chemical has become a synonym for something artificial, adulterated, hazardous, or toxic." She characterizes chemophobia as "more like color blindness than a true phobia" because chemophobics are "blind" to most of the chemicals that they encounter: every substance in the universe is a chemical. Francl proposes that such misconceptions are not innocuous, as demonstrated in one case by local statutes opposing the fluoridation of public water despite documented cases of tooth loss and nutritional deficit. In terms of risk perception, naturally occurring chemicals feel safer than synthetic ones to most people. Consequently, people fear man-made or "unnatural" chemicals, while accepting natural chemicals that are known to be dangerous or poisonous.

Causes and effects
Chemistry professor Pierre Laszlo writes that historically chemists have experienced chemophobia from the population at large, and considers that it is rooted both in irrational notions and in genuine concerns (such as those over chemical warfare and industrial disasters). Professor Gordon Gribble has written that the start of chemophobia could arguably be attributed to Silent Spring, and that subsequent events such as the contamination of Times Beach and the disaster at Bhopal, India only exacerbated the situation.

According to the American Council on Science and Health, chemophobia is a growing phenomenon among the American public and has reached "epidemic" proportions among the general public. In a book published by the Council, Jon Entine writes that this is in part due to the propensity of people to show alarm at the reported presence of chemicals in their body, or in the environment, even when the chemicals are present in "minuscule amounts" which are in fact safe. Elsewhere, Entine has argued that chemophobia is linked to a precautionary principle in agricultural policy, which could jeopardize the world's ability to feed its ever-expanding population.

In the United Kingdom, Sense About Science produced a leaflet aimed at educating celebrities about science, in which it said that humans carry only small amounts of "chemical baggage" and that it is only because of advances in analytical chemistry that we can detect these traces at all.

Philip Abelson has argued that the practice of administering huge doses of substances to animals in laboratory experiments, when testing for carcinogenic potential, has led to public chemophobia by raising unjustified fears over those substances' effect on humans. He sees an opportunity cost in the "phantom hazards" such testing conjures, as it distracts from attention on real hazards posed to human health.

Treatment and prevention
Efforts have been made by chemists to counteract Chemophobia. Targeted science education can reduce anxiety in people with chemophobia. Particular effort has been made towards educating consumers on the safety of food additives and prepackaged foods.

A critical point in combating Chemophobia, according to Michelle Francl, is addressing the apprehension that the general public has towards Chemistry. David Smith, a teacher and Youtube content producer, created a comprehensive project involving the creation of videos based on interesting topics in chemistry. Smith's students have said that the video-making experience was preferable to traditional written reports, and made them feel more engaged and comfortable with the subject.

A study was conducted on 29 elementary-school-age children, in which the children read a short story involving chemistry, observed some experiments related to the story, and then drew pictures to reflect on the activity. The majority of the students agreed that they enjoyed reading the story and watching the experiments, and the scientific literacy and engagement of the students was judged, by the researchers, to have improved.

Industry response
The chemical industry has regarded chemophobia as a problem. In 1980 James Sites gave a speech on behalf of the Chemical Manufacturers Association in which he described chemophobia as a threat to the nation: "It is part of an anti-science, anti-technology, anti-growth mood which, unless checked, could have devastating consequences for our nation and our future." More recently, industry figures have proposed more rigorous certification of products as a "reaction" to the chemophobia and the "outrageous claims" made; by embracing "some kind of third-party verification" the industry could claim increased credibility with the scientific community, the media and the public.