![]() ![]() Inhalation (breathing) of gases, vapors, dusts or mists is a common route of exposure. ![]() There are three major means by which a toxic substance can come into contact with or enter the body. ![]() For example, two aspirin tablets can help to relieve a headache, but taking an entire bottle of aspirin can cause stomach pain, nausea, vomiting, headache, convulsions or death Routes of Exposure Large amounts of a relatively harmless substance can be toxic. The greater the amount of a substance a person is exposed to, the more likely that health effects will occur. For example, children are given smaller amounts of aspirin than adults because an adult dose is too large for a child's body weight. If a child is exposed to the same amount of chemical as an adult, the child (who weighs less) can be affected more than the adult. An important factor to consider in evaluating a dose is body weight. It is only the dose that makes a thing poison." The dose is the amount of a substance that enters or contacts a person. Over 400 years ago, a scientist said ".nothing without poisonous qualities. No matter how dangerous a substance or activity, without exposure, it cannot harm you.
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