The biased uncertainty of each measurement method was based on previous studies, specifically 3% uncertainty in particle mobility diameter by DMA classification 68 , 4.7% uncertainty in particle aerodynamic diameter by AAC classification 69 , 2.8% uncertainty in particle mass by CPMA classification 70 and 10% uncertainty in particle concentration using a CPC 71
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Harmful Components in Tar Cigarette tar contains many harmful substances, such as: Polycyclic aromatic hydrocarbons (PAHs) : These are potent carcinogens found in tar due to the incomplete combustion of tobacco leaves
A recent study conducted by the National Academies of Sciences, Engineering, and Medicine found that people who use e-cigarettes may be inhaling dangerous levels of heavy metals like lead and nickel, which is a concern that conventional cigarette smokers also face
