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Collider bias can arise if there are confounders of the effect of smoking on vaping (denoted intermediate confounders in the diagram), such as individual smoking histories, or parental smoking/vaping (for youth)

Your gallbladder stores the bile from your liver, an essential chemical that breaks down fat in what you eat

The Dust Bowl was a series of droughts during the 30s that devastated farmland throughout the Great Plains region, turning workable soil into dust that flew around in dangerous wind storms

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