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Exposure to tobacco smoke not only have both direct and indirect effects on the health of human but also affects all stages of human reproduction and development [33].Tobacco contains more than 4000 compounds, out of which at least 70 compounds have been identified as carcinogenic [15].According to statistics, approximately 46% of men aged 2039 years smoke, and the actual use of cigarettes increased from 721 million cigarettes in 1980 to 967 million cigarettes in 2012 [34]

Dual filters a step up the evolutionary ladder consist of two filter segments, each with different design parameters such as pressure drop, porosity, etc

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It will be shipped rolled in a sturdy tube

Retrieved from [Biology, Animal Structure and Function, The Respiratory System, Gas Exchange across Respiratory Surfaces | OER Commons] LibreTexts

I was breaking (other) plastic trying to pry in other spots and now it seems really obvious