Smoking is a cause of chronic bronchitis, emphysema, and lung cancer. Cigarettes contain chemicals that the air passage and lungs; a smoker might have one or all of these disorders or diseases.

The correct answer is - leading and irritate.

Explanation:

Diseases related to the lungs such as COPD (chronic bronchitis and emphysema) are mainly caused by smoking as it is found that smokers die 12 to 13 times more likely than people who do not smokes. Tobacco smoke can result in cancerous cells in the lungs that can develop into lung cancer.

Chemicals that are present in the tobacco of the cigarettes cause inflammation and irritation in the air passage and lungs of the person smoke which leads to these conditions eventually.

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