did doctors promote cigarettes Is This a Real 'More Smoke Camels Than Any Other Cigarette' Vintage Ad? Surgeon General's 1964 report: making

What is already known on this topic Cigarette smoking is the leading cause of preventable death worldwide

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Yet, considering the importance of mitochondrial dysfunction in COPD and the increasing evidence highlighting mtDNA gene expression and methylation as potential biomarkers in a variety of diseases related to mitochondrial dysfunction and ageing, future studies may explore the impact of age and smoking status of COPD patients to provide a deeper understanding on mtDNA methylation and gene expression