Smoking is the most common cause of COPD. Even at late stages of the disease, Smoking cessation reduces the rate of worsening lung function and delays the onset of disability.
Smoking is highly addictive and it harms almost all organs. It is a major risk factor for the most common causes of death. Cigarettes contain about 600 ingredients and when they burn, they generate more than 7,000 chemicals, many of which are poisonous or carcinogenic.