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smoking one cigarette a week Just Daily Raises Coronary Disease and Stroke Risks: Meta-analysis smoking 1 cigarette a month
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95% Approximately 95% of smokers started smoking before they reached the age of 21
[14] The gender gap tends to be less pronounced in lower age groups

The mean RR of breast cancer at 20 pack-years was 1.17 (1.041.31

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Smoking and fatal prostate cancer in a large cohort of adult men
& Willett, W