Exact(25)
Although particle counts differed significantly between different cigarette types (Table 2), they did not differ much below 40 nm, whereas above 40 nm the highest tar cigarette revealed excessive particle yields due to a very rapid increase.
In this study we have investigated the ability of a QCM, integrated into a whole smoke chamber (Figure 2), to detect mass differences between two different cigarette types of different tar deliveries, a 3R4F Kentucky reference cigarette (pack tar value of 9.4 mg/cigarette), and a 1 mg pack tar commercially available product.
In addition, the pre- and post-exposure breath concentrations were both significantly different among the subjects, yet the ratios of post-exposure to pre-exposure breath concentrations did not differ significantly between the different cigarette brands.
Exploratory data analysis indicated that there may be a potential pack type by brand name interaction, that is, the relationship between packaging types (branded vs plain packaging) differed for the two different cigarette brand names.
Despite the fact that commercial brands of cigarettes sold in the U.S. differ in terms of tobacco blends, flavorings, general construction attributes, and 'tar'/nicotine yields, epidemiological studies indicate essentially no significant difference in lung cancer risk among long-term smokers of different cigarette brands or styles (i.e., ultralights, lights, or full-flavor) [ 44- 48].
Data indicated there was a clear difference in particulate depositing on the inserts from each of the different cigarette types, with a greater amount of particulate depositing from the highest delivery 10 mg 3R4F product, followed by the 6 mg product which in turn is greater than the 1 mg product.
Similar(35)
Finally, a comparison between the chemical profile of smoke from the different cigarettes was made.
This study has also shown that different cigarettes can yield varying amounts of nicotine and pyridine depending on the type of cigarette primarily because of potential different growing conditions and additives introduced during tobacco processing.
All previous references to the presence of hydrazine in tobacco and STPs are based on a single study from 1974 [9] which measured the hydrazine contents of tobacco from five different cigarettes (4 experimental and 1 commercial).
The implications of the findings are discussed, particularly the possibility that the intratracheal/instillation technique might be useful as a rapid bioassay for comparing the tumorigenicity of different cigarette-smoke condensates.
This would be useful for deposition dose-range studies of different cigarettes types, for example.
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