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10 cigarettes a day for 20 years What is 20-year smoker's pack-year history? 10 cigarettes a day for
Description
For consistency and easy comparison, we categorized the comparison groups according to their exposure type and frequency of exposure

The 10 mg of tar, from the first puff, is felt by the density of the smoke

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For the RCT, participants were eligible if they met the following criteria: 18 years of age
