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Damaged Epithelium : Smoking damages the respiratory epithelium, the protective lining of the lungs, making it easier for pathogens like bacteria and viruses to penetrate and cause infections

(Although the answer to the last question is yes for those in a rush)

It still matters" The Guardian , 10 March 2016 Pimlott, Ben

Jasjit Ahluwalia, a professor of behavioral and social sciences and medicine, noted that some college students approach smoking casually, treating nicotine sort of like caffeine. He said that nicotine is a recreational drug for many smokers who might enjoy a specific aspect of smoking a cigarette or the habit of having one at a set time in the day