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Heavy cigar smoking, especially when the smoke is inhaled deeply, can increase the risk of developing coronary heart disease, emphysema, and chronic bronchitis

Are Vapes More Harmful Than Cigarettes

Journal of Aerosol Science 19 , 587589, (1988)

Creating a smoking machine Researchers engineer instrument that replicates cigarette smokes impact on human airways While it is well known that cigarette smoking is a major cause of lung disease, and a key exacerbating factor for patients suffering from chronic obstructive pulmonary disease (COPD), it has not been possible to effectively model its deleterious effects on human lungs under normal breathing conditions