Very good point. Have to be careful with that. Luckily I knew about that and my popcorn was done late enough that it did not have any.For those of you looking to remove popcorn ceilings, please be careful. Asbestos was commonly used in popcorn ceilings. Scraping asbestos can release small particles of it into the air and into your lungs.* Also, if you're in the US, the Clean Air Act also regulates how asbestos is to be disposed (i.e., you can't just toss it into your trash).
*Asbestosis can develop as a result.