This document discusses the effects of perfumes and fragrances. It notes that perfumes can contain up to 600 chemical ingredients, but less than 20% have been tested for toxicity. The fragrances can cause health effects on the skin, lungs, and brain, and can trigger asthma attacks in many people. The chemicals are absorbed through the skin, nose, and mouth and transported throughout the body, potentially causing symptoms like headaches, sneezing, and difficulty concentrating. The best way to avoid negative effects is to avoid using fragrances.