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In Model 4, MI was associated with both tobacco use and khat chewing after controlling for other classical risk factors outlined in the model

Stratified analyses After stratified analyses according to pulmonary diseases (Table 3), the association between smoking behavior change and the risk of pneumonia hospitalization was more prominent for participants without underlying pulmonary disease (P for interaction = 0.007), with 8% lower risk of pneumonia in quitters without underlying pulmonary diseases (aHR 0.92, 95% CI 0.870.97) compared to no lower risk for quitters with underlying pulmonary diseases (aHR 1.05, 95% CI 0.971.13)

Well, I dont know is the short answer

It may leave a menacing mark, but is actually a well manageable tool

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