The phrase "dangerous substances" refers to materials or chemicals that can cause harm or be harmful to people, animals, or the environment. Full definition
It sometimes seems as if our environment is full of dangerous substances that cause diseases such as cancer, and that such ailments must be a product of modern times. (newscientist.com)
Did you know that there are these potentially dangerous substances lurking in some of the products? (personaltraining4u.net)
First off, sugar is arguably the most dangerous substance on the planet and should be avoided like the plague. (cancertutor.com)