Men who smoke are 24 times more likely to develop lung cancer than men who don't The lifetime risk of developing lung cancer for men in the US is 1 in 15  Based on this information, I naturally frequency-wise chose to start with 1500 men, and built this tree, which should help us to compute some conditional probabilities   A) Given that a male is a smoker, what's the chance that they have lung cancer?   B) Given that a male is a non-smoker, what's the chance that they have lung cancer?   C) Given that a male is positive for lung cancer, what's the chance that they're a smoker?

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