775 



438 



AMERICAN REVIEW OF RESPIRATORY DISEASE VOL 148 1993 



10 20 30 40 SO 



NumOer of Cigarettes per Day 



FIgun 2. Scanef pkx and Spaarman convlalion of the sell-raported number of cigaranes currsnOy smoked per 

 day and the and-tidal cartxin monoxide level (ppm) 



to tobacco combustion products across the range of tar and nico- 

 tine yields of cigarettes mcst often used in the general population. 

 Several limitations must be considered in the interpretation of 

 these results. Because we used self-reports of smoking habits, 



incorrect reports of brands may have resulted in misdassifica- 

 tion of axposura However, tor current brands we do not antici- 

 pate substantial bias. In a nuKlomized trial to prevent heart dis- 

 ease among factory workers in the United Kingdom, Peach and 



at 



c 



o 

 u 



. s 



: • s 

 '..5 



I:! 





:»• -' 



r - 0.S3 

 (p < 0.00011 



PIgmi 

 day and 



O 10 20 30 40 so 



NumDer of Cigarettes per Day 



Scarnr pM and Spearman coneHMon of the aatl-ceportad num«>»r of cigannea eurrwOy amoked ( 

 the aaHvary coonlne level (ng/ml) 



