The Huffington Post discusses the six ways smoking can worsen the quality of your sleep.

A 2013 study from researchers at the University of Rochester Medical Center found that smoking tobacco can alter the expression of clock genes in both the lungs and the brain, thus ruining a restful night’s sleep. After exposing mice both chronically and acutely to cigarette smoke, the researchers noticed a substantial disruption of their natural circadian clocks, which only worsened with increased tobacco exposure. The consequences of this disruption of circadian rhythms moved beyond poor sleep to include risks of developing depression, anxiety and various mood disorders.

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