The risk of lung cancer in a smoker rises with
- A. the brand of cigarette
- B. the time of day the cigarettes are smoked
- C. the length of the filter
- D. the number of cigarettes per day and the number of years of smoking
Explanation
Cancer risk follows cumulative dose: each cigarette adds exposure to carcinogens over years of tissue damage. No brand or filter makes the dose safe.
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