why is cigarette smoking harmful It's Never Too Late to Break Free from Smoking is Injurious to Health

Next, to assess whether the CSE induced defects in mitochondrial respiration were accompanied by changes in mtDNA genes, the expression of mitochondrial protein coding genes was determined for MT-CYB and MT-CO2 in cells exposed to gradually increasing concentrations of CSE, harvested at 3.5% (at 4 weeks) and 5% or 6% CSE (at 10 and 12 weeks)

Cigarette smoking remains the leading avoidable cause of premature death in the United States, accounting for approximately 500,000 deaths or 1 in 5 deaths annually

And starting to smoke with menthols can make it harder to stop smoking

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