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If a product Containing 60% plaster of Paris is used for sanding indoors wothout ventilation or mask for 3 days what is the likelihood of silicosis?

Hi, Has anyone been exposed to plaster dust that contains plaster of Paris and a joint compound mixture from sanding? I was in the home when the worker was sanding and was w/o a mask amd there was no ventilation. Was not aware of dangers until the work was completed after 3 days. I am very...