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Tong, F., Wolfson, D., Jenn, A., Scown, C
Long-Term Inhalation Studies In a combined toxicity-carcinogenicity study, groups of 120 male and 120 female Fischer 344 rats were exposed to actual concentrations of ethylene oxide of 18 mg/m 3 (10 ppm), 58 mg/m 3 (32 ppm), and 173 mg/m 3 (96 ppm), for 6 h per day, 5 days per week, over 25 months
Since the average cigarette pack contains 20 cigarettes, the researchers expected that the risk of heart disease or stroke for a one-cigarette-per-day smoker would be just 5 percent of that of a pack-a-day user
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