what smoking cigarettes does to your body Cigarette and Health SEE: 9 nasty effects smoking

Cigarette smoke contains nitrosamines, a class of powerful carcinogens

"Additionally, the tiny pores in plants known as stomata can become clogged from cigarette smoke, reducing their ability to take in carbon dioxide and release oxygen

Leopold PL, OMahony MJ, Lian XJ, Tilley AE, Harvey BG, Crystal RG

A study from The University of Texas MD Anderson Cancer Center found that increasing doses of varenicline or switching from combined nicotine replacement therapy (CNRT) to varenicline significantly improved smoking cessation rates in patients who initially failed to quit

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