Tobacco smoke has many chemicals and particles that irritate the airways and lungs. This can lead to chronic obstructive pulmonary disease (COPD).
Furthermore, cigarette smoke contains a number of cancer-causing substances (carcinogens) which damage normal lung tissue.
At first your body may be able to repair this damage. But with each repeated exposure, normal cells that line your lungs are increasingly damaged. Over time, the damage causes cells to act abnormally and eventually cancer may develop.
Approximately 90% of lung cancers are smoking related. We know that by stopping smoking, one can reduce ones risk of developing lung cancer.
Between 20% - 30% of lung cancers are caused by “second hand” smoke either at home or at work. Smoking is also associated with many non-malignant conditions of the lung such as chronic bronchitis, emphysema, pulmonary hypertension all of which can cause significant symptoms.
Cigarette smoke is a carcinogen (chemical that causes cancer). By affecting the DNA of cells with in the lung It can cause a normal cell to develop into an abnormal or cancerous cell. This cell will continue to divide uncontrollably thereby causing a cancer to develop. Eventually, the cancer will start to cause symptoms and can spread to other organs with in the body.