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Answer 1: in first case the two data comparison makes it case control study in which the cases of lung cancer through smoking is compared with the case of other malignant tumor (take as control ) in which it analyse the how the effect of smoking is m View the full answer Transcribed image text: Lung Cancer & Smoking Case Study A causal relationship between cigarette smoking and lung cancer was first suspected in the 1920s on the basis of clinical observations

If the high CO levels are caused by wildfire smoke, youll likely need to evacuate as ventilating will only introduce more pollutants

Such bare-faced thirst has rarely sounded so tender.

Second hand smoke or passive smoking (breathing in someone elses tobacco smoke) also increases the risk of lung cancer and other smoking related diseases, and is particularly dangerous for children as it can increase their risk of developing health conditions like asthma and respiratory conditions

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