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The scientific case that cigarettes were addictive also made it harder for Big Tobacco to defend their practices

Reparative mucosal hyperplasia was present in tracheas of rats exposed to higher concentrations of smoke, indicating that initial loss of epithelium occurred earlier at the higher, presumably more toxic, exposure levels allowing sufficient time to begin replacement of lost mucosal epithelium prior to study termination

Requests to access the datasets should be directed to [email protected]

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