In response to increasing evidence implicating cigarette smoking as a cause of lung cancer in the 1950s, tobacco manufacturers introduced filtered and “lower-tar” cigarettes to allay consumer concerns, knowing they did not actually reduce health risks. Puncturing ventilation holes of varying sizes and numbers into the filter to dilute inhaled smoke became the optimum way to reduce tar yield.1
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Tanner NT, Thomas NA, Ward R, et al. Association of Cigarette Type With Lung Cancer Incidence and Mortality: Secondary Analysis of the National Lung Screening Trial. JAMA Intern Med. Published online October 21, 2019. doi:https://doi.org/10.1001/jamainternmed.2019.3487
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