cigarettes cause coughing Smoking Causes Coughing' Review: Quentin Dupieux's Superhero Comedy Smoking Causes Coughing - Thinking
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Depending on which airline you're flying with and what country you're heading to, you may also be subject to further specific regulations on bringing cigarettes

Therefore, stopping the use of nicotine products lowers your risk (even though some damage may have already occurred from previous smoking)
Am J Physiology-Cell Physiol

As smoking reduces the high-density lipoproteins (Good cholesterol) it impairs the ability of the body to get rid of low-density lipoprotein (LDL)

It is remarkable how harmful smoking is -- even low doses of smoking confer large cardiovascular risks