When i was at work i attended a very good course on this subject with some very good points.
Asbestosis (mesothelioma) is caused when you BREATHE in particles. A vapour under a microscope is a particle so this could be a problem, always wear a mask.
Yes i am guilty of not always wearing a mask i admit. But i try to.
I was told a true tale, a guy worked in the asbestosis industry all his life but he never got asbestosis, his wife did however, she washed hid clothes and the dust got to her lungs. recounted to me by a Coroner.