What exactly is the harm of smoking? What happens at the cellular and tissue level? And there's an inflammatory process🙌🏻 And if smoking is not a one-time action (like "indulging"), and the tobacco smoke gets daily - inflammation becomes chronic. It develops due to damage to the bronchopulmonary system by toxic substances found in tobacco smoke. The resulting chronic inflammation causes significant mucus secretion, which the smoker is forced to "cough up". This is already called smoker's cough. It begins to bother tobacco smokers after about 5-7 years.