If chemicals can be used safely, why are there some people who still express serious concerns about their use?

Many people fear things that they know very little about. In fact, people naturally have a tendency to fear anything that is man-made, especially chemicals. However, many people do not recognize that there are things that occur in nature including natural chemicals that can be just as toxic or even more harmful than man-made substances. It is important to recognize that it is the dose that makes the poison. All substances can be toxic (including water) depending on the dose. The products used to control weeds on lawns have relatively low toxicity are applied at low rates and do not pose a significant risk when applied and stored according to their directions.