half a pack of cigarettes a day Everyone knows that smoking is bad for your physical health, but it's bad for your financial health, too. steady smoking habit can cost you thousands dollars per year, and that 1965 Ad Half and Half

Acknowledgements We thank Dr Kyoji Okita for insightful comments and for his role in the preparation of the graphs contained in this manuscript

Nervous System Tobacco use reduces the flow of oxygen to the brain, which can lead to a stroke

*I have been known to smoke a pipe on a holiday or a cigar at a special dinner.

Analyzing the effects on gene expression and DNA methylation that are shared between smoking and aging, the researchers noted that in people who quit smoking, non-reversible DNA methylation sites in the lung were enriched in DNA methylation sites that are associated with aging signatures, but this wasnt the case for reversible and partially reversible sites suggesting that the smoking effects that affect DNA methylation in common to aging are more persistent in time. This was not the case for gene expression changes

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