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Biological Plausibility - Sometimes we know, sometimes we don’t

Alternate Explaination Eliminated: Hard to prove a negative

Cessation Effect: Risk Drops in absence of exposure to the risk factor

Specificity of the Association: Specific Exposure Associated with only 1 disease - throw back to Infectious disease theory - Not generally applicable as Shown by previous discussion of Frame Work of Causation

Dose response strong evidence for Causal relationship