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In addition to environmental exposure, severe respiratory illnesses like RSV and some types of pneumonia or bronchitis can also lead to bronchiolitis obliterans

These aren't first class, genius level historians at these things

PMC 6921295

During this process dentists also expose your teeth to a special laser or light to increase the results of the process

Jordan Goodman, Tobacco in History and Culture (2 vol 2005) p