Many homes built before 1980 were built with asbestos products. This includes popcorn ceilings and other materials that many folks would not recognize as containing asbestos. It is critical that before you try such a project in your home that you, or a certified contractor, tests before disturbing the material.
Strict rules apply to contractors who work with products potentially containing asbestos. When contractors fail to follow the basic safety rules around asbestos, they risk harm to all of us around the project who are exposed. No level of asbestos exposure is safe.
Be safe when doing home improvement projects. Remember to test, not guess, when it comes to potentially toxic hazards.