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With every week and month that passes, your lungs will get stronger, breathing will become easier, and your risk for smoking-related diseases will plummet

doi: 10.1186/s12929-015-0212-5

Chronic bronchitis is most common in smokers, since smoke irritates the bronchi and leads to long-term inflammation

Studies in laboratories and animal models suggest that cigarette smoke can weaken the guts protective barrier
