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Also Jay, I wonder if you heard of "Genetic predisposition". Some people have mutated genes that make them more susceptible to acquire a certain disease under CERTAIN environmental factors. A famous example of genetic predisposition would be Diabetes, With absence of environmental factors one may die without getting diabetic although they have diabetic genes. Other examples: Alcohol addiction (funny right?), Depression, Hypertention, etc.

So you may wanna edit your Poll and add an extra option.