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cigarettes per day in laryngeal cancer life history Association of smoking status, duration and amount with the risk of head and neck subtypes: a national population-based study USA Cigarettes Sold v. Lung
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Mol Psychiatry (2015) 20:433
These combined effects from various chemicals in tobacco smoke lead to a significantly higher risk of cancers, including lung, throat, mouth, and esophageal cancer
Gradually reduce your nicotine intake over time

The phrase is commonly used as a humorous expression rather than a literal statement about smoking
