Oh! I forgot about this one!
A friend was stripping asbestos from some old pipes in a hospital- it was all above board and legal with the area sealed off with plastic sheeting and clean air going in with filters for the air going out. Air showers the lot- safety checked and everything.
All employees were suited and booted to the correct standard with expensive air helmets... which... they regularly took off to have a crafty smoke. In order not to get caught, they smoked near the air outlet- (where the greatest concentration of particles were) and had a slit in the sheeting to let the smoke (and asbestos particles, of course) out.
Smokers are more likely to catch asbestosis (or mesotheleoma) because they have fewer hair in their airways which stop particles.
Mesotheleoma only develops after many years (like 25 years). 1 (one) particle can cause it.
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