Who is at risk for developing mesothelioma?

Uhhh, I don't think chrysotile dissolves in your lungs. The fibers in asbestos cause scar tissue, but at least it isn't as friable as other forms. There's really no safe dose, but one day of exposure is a pretty small dose. Mesothelioma has a long latency period (20-50 years) and the people who get it tend to work in industries with high daily exposure or have family members who do (presumably from handling their clothes, etc.).

There are a lot of people who made it out of the heyday of asbestos without succumbing to these things (and that stuff was in more than 3000 products, so a lot of people were in contact). You could familiarize yourself with the early symptoms and file that away for 25 years from now, but this is probably not how you'll die, so I wouldn't spend a lot of time stressing.