Do you have a source for this use? As I [read it](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5506114/), whole lung lavage is a treatment for [pulmonary alveolar proteinosis](https://rarediseases.org/rare-diseases/pulmonary-alveolar-proteinosis/) a rare disease in which proteins build up inside the lungs. While smoking is thought to be one possible trigger for this disease, I can find no reference to its use to reverse any of the common effects of smoking.
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