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Many people wonder how many years of smoking causes cancer, but there is no exact timeline because cancer risk depends on how long and how much a person smokes

This is basic toxicology 101, a foundational principle every first-year med student learns: The dose makes the poison. Paracelsus, the father of toxicology .[20] Just because something occurs naturally in trace amounts doesnt mean its safe or beneficial in highly concentrated, pharmaceutical-like doses

When looking at an air purifier, look at the cubic feet per minute in airflow at the lowest setting

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