Yes! chemicals spray are very harmful, it is made of variety of chemicals, it can affect the health of individual. even plants,
a plants chemical spray such as an inorganic fertilization that can spill out through the plant in order to grow is very dangerous, when an organism take it, it can greatly affect healths.
also, the spray household, it can be used to kill insect, its very dangerous, when a person inhale those chemical it will automatically absorbed by the lungs, causing it to lead some disease.