As explained in the academic books "Understanding Environmental Pollution" and "Molecular Biology and Biotechnology: A Guide for Teachers," all substances (even water and oxygen) become poisonous at a certain dose, and natural substances are sometimes more harmful to people and the environment than the same doses of synthetic substances. The second of these books goes on to note that "the experiences or products you avoid because of faulty assumptions and misinformation affect the quality of your life and the lives of those around you. Thus, even though it may be tempting to let misperceptions and emotions shape your ideas about risky products and activities, there are risks in misperceiving risks."