Based on the Bradford Hill's criteria for causation a strong association has a higher likelihood of having a stronger causal component compared to a modest association. As such, there is an existence of high levels of risks ratios in relation to the association existing between exposure to secondhand tobacco smoke and lung cancer. In this respect, Hill's criteria provides that the absence of a considerable strength of association between exposure to secondhand tobacco smoke and lung cancer may not be used as the basis for ruling out any existing causal effect. There is a general acknowledgement that the impression created by the level or extent of strength of association between exposure to secondhand tobacco smoke and lung cancer is largely influenced by the type of index adopted in relation to the magnitude of association.
Considering the evaluation in accordance with Hill's criteria for causation, I believe that the strength of the relationship is as strong as I have been led to believe. This is because, such a belief and claim can be supported by various documented data and statistics associated with researches previously carried out to establish the strength of that particular relationship. The existing information and evidence linking most case of lung cancer to exposure levels of smoking is a clear indication that there is strong causation strength between the exposures to secondhand tobacco smoke. However, there is the question of the likelihood of bias that arises with regard to the presumable association thus making it a bit challenging determine if the determined causation strength and association is influenced by genuine or biased data. To that extent, there is a considerable level of credibility with regard to the evaluation findings obtained through the application of Bradford Hill's criteria for causation in examining and analyzing the causation relationship between exposure to secondhand tobacco smoke and lung cancer.
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