While a number of cohort studies used multivariable analysis to attempt to adjust for these factors, unmeasured confounding is always a threat to internal validity in observational studies
And my lungs were bothering me and I'd had pneumonia two or three times
However, in the United States, alcohol is now considered the third leading preventable cause of cancer, following tobacco and obesity
Impact of Canadas menthol cigarette ban on quitting among menthol smokers: pooled analysis of prepost evaluation from the ITC Project and the Ontario Menthol Ban Study and projections of impact in the USA
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A key component of vaping devices is the e-liquid, which contains ingredients such as vegetable glycerine and propylene glycol