The fumes produced when starting vehicles or burning charcoal and wood also emanate CO
The variation of score observed between different groups was statistically significant [Table 2]

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Stellman Edith Zang Background Cigarette smoke yields of tar and nicotine obtained under the Federal Trade Commission (FTC)-specified machine-smoking protocol (35-mL puff volume drawn for 2 seconds once per minute) may not accurately reflect the delivery of toxins and carcinogens to the smoker