Exposure to asbestos is associated with all major histological types of lung carcinoma (adenocarcinoma, squamous cell carcinoma, large-cell carcinoma and small-cell carcinoma). The latency period between exposure and development of lung cancer is 20 to 30 years. It is estimated that 3–8% of all lung cancers are related to asbestos.[21] The risk of developing lung cancer depends on the level, duration, and frequency of asbestos exposure (cumulative exposure).