When you have a substance that is labeled "For External Use Only" and it's used in a way that manages to pack large quantities, asbestos or not, deeply into int

When you have a substance that is labeled "For External Use Only" and it's used in a way that manages to pack large quantities, asbestos or not, deeply into internal organs, then perhaps adverse effects can be expected. "Junk science" is a charitable description of what was perpetrated in those studies.